78 comments

[ 1.7 ms ] story [ 200 ms ] thread
I think someone is missing the joke, but I can't tell if it's me or not.
I assume that often these theories are first perpetuated by someone who is joking, but then people take it seriously.
Kind of like Scientology, except less well funded.
If you really work at it, you can trick yourself into believing damn near anything's true.

Sometimes you don't even have to really work at it.

As Feynman put it: "The first principle is that you must not fool yourself – and you are the easiest person to fool"
Besides the common community, what does this new concept have to do with flat earth? They seem orthogonal.

Also, I can set up at least half a dozen different experiments to let me "experience" that the Earth is round. Is Flat Earth Theory just another set of blinders we get to put on if we want?

As far as I can tell there's a huge overlap between flat earthers and fundamentalist religious beliefs. If you go digging into their resources you'll very often find treatises about "the science of the Bible" and similar things. As such you'll often see the same people arguing for a flat earth, intelligent design, 6000yo earth and similar things.

See for instance this video I was just watching: https://www.youtube.com/watch?v=-LNT3CucL6c

It's a video about how NASA supposedly fakes the Mars rover pictures, yet the description starts with "I believe the pope of Rome is Antichrist (Daniel 7:7-27,2Thessalonians 2:1-12,2Peter 2:1-22,1John 2:18-25, Revelation 13:1-9) and Rome 'Mystery Babylon the Great the Mother of Harlots and Abominations of the Earth' (Revelation 17:1-18)."

This is one of the first resources on the "flat earth society" website: http://www.theflatearthsociety.org/library/books/Is%20the%20...

I haven't read through it but it features a chapter called "The Bible and science", an other "Moses and geologists" and a third one "science versus christianity".

I'm sure this tale of a primeval forest being destroyed by evil beings resonates with people who believe in flood myths and the like.

In the end all these conspiracy theories are about rejecting science and the "new world order/illuminatis/freemasons/..." who are the work of the devil trying to corrupt us so that we stray away from god's path, or somesuch.

Scientology has clear paths to make money from their nonsense... What's the goal with arch trees/flat earth theory?
Maybe some of the more influential ones sell books and speak at seminars? I mean the article talks about a video being viewed hundreds of thousands of times, and articles like this will only get them more viewers - which equals money.
I don't think there is a goal. I think it's a relatively organic community made up of loosely connected people who are all susceptible to conspiratorial thinking.
> What's the goal with arch trees/flat earth theory?

It's a very efficient fruitcake detector. It's sort of like a pyramid marketing scheme -- the dumbest people naturally float to the top.

Similar to your point - with some conspiracy theories I get the emotional reasons for believing in them. Global warming denial, 9/11 was done by the government, etc. I get that on an emotional level the reality is pretty hard to handle, so the conspiracy theories are a sort of security blanket. However ridiculous they are, I can see how they are appealing on some level.

But what's the emotional advantage of believing in a flat earth? And who is the imagined evil enemy who benefits from making us all think the Earth is a spheroid?

To be different. To prove that YOU know something that all the others don't. For some people, this gives them meaning, a group to belong to, and reasons to hate/distrust others.
I guess you're right. It makes me wonder how many of own opinions might just be subconscious grabs for attention, even when I believe they're rational and carefully considered. It is a little unsettling if you think about it for too long!
> 9/11 was done by the government

One does have to wonder why, though, despite being one of the largest civilian tragedies ever to happen on our soil, no forensic analysis of the destroyed structure was done. Instead it was all picked up, put in trucks, then shipped overseas to be recycled.

Then, virtually out of nowhere, we get a multi-hundred page document produced laying out new legislation (aka US PATRIOT Act), which was so swiftly voted on and passed that it was absolutely apparent that little to none of it had been read (or if it had, it was read long before it was ever introduced!); we know for a fact that many congresspersons admitted to not reading it before voting on it!

Neither of these things had to happen. Both could have been done differently. Forensic analysis of the structure could have been performed. It would have been expensive, it would have been an engineering nightmare - but it could have been done. We are able to piece together down passenger jets; this would have been an order of magnitude or more greater in difficulty - but had we tried, we could have done it, and our knowledge would be that much better to make decisions with.

But we didn't. And we still don't have an answer for why it wasn't done. I'm not even certain that the question has been raised much.

Instead, we relied upon gut instincts and other emotional factors to pass a piece of legislation that appeared out of nowhere fully written, which couldn't have been developed in the short amount of time it was. It was as if the material presented was already available, waiting for the moment it could be unveiled. Shades of ALEC legislation, in fact. But it wasn't questioned, and those that did question it were called anti-American or worse, for daring to wonder why such wide reaching legislation wasn't honestly reviewed and debated upon by our representatives in government. We are still living with the repercussions of that decision today.

These items are two distinct but intertwined pieces of history which have changed our country and the world. There are many other questions about that day and the days that followed which we the people don't have answers for, or the answers we do have seem vague, even deceptive, when examined closely.

I'm not saying the "government did it", nor am I saying anything that the current understood narrative doesn't say. I'm more interested in what the narrative leaves out, what it doesn't say, what it doesn't explore - and why it isn't being explored, and why we continue to let it be unexplored. Likely, it is already too late to get any answers for these unanswered, and in some cases unasked questions which surround that fateful day in our history.

We probably fear what the answers would reveal, which is why we didn't ask the questions, and why we suppressed those who dared to.

Entertainment. While those of us on HN might write code for fun, these people choose a different way to spend their free time. And like we might want to share our code with the world the same holds true for their creations.
Hey, that's the 'mountain' from Close Encounters of the Third Kind.
The most unbelievable thing of all of this is that I spent an hour watching the video.

https://www.youtube.com/watch?v=UHkiZNT3cyE

I started taking notes on everything that was wrong, but literally ran out of ink. I advise watching at 1.5x speed.

This is sheer beauty. Once upon a time I would experience anxiety when I ran into this kooky stuff. Now I find it delightful because I have come to realize that is it impossible to have a rational discussion with irrational people, and in any society there will always be a significant population that does not yield to rational thought. While one might argue that such people are detrimental to the mental and intellectual health of a society, I find those claims to be mostly posturing. With some exceptions, these people are mostly harmless. So what to do? Why fret about it? Study the phenomenon and enjoy it.
I think if you broaden your view a bit, you'll see why it's not harmless: climate change deniers fall into the same basic group, as do anti-vaxxers. Both dangerous for different reasons.
I think if you broaden your view a bit more, you'll realize that humans are at heart irrational animals. Understanding, appreciating, and respecting the flat-earthers is a way of understanding and appreciating yourself, because you never truly see the many ways you are broken.

It's the ones that don't understand this who are truly dangerous, not folks who believe weird stuff. You can believe anything you want with a spirit of humility and openness.

Erm, no, people that believe things like vaccines or climate change are conspiracies do actual, measurable harm.

Humans are irrational, indeed. That doesn't mean that some of the far-out crazy isn't directly or indirectly harmful.

> ... it impossible to have a rational discussion with irrational people ...

Not necessarily.

Many are able to compartmentalize irrational beliefs into their everyday lives. You can have folks that appear perfectly rational in almost all things and live full professional lives. Yet when they discuss their tar-baby, "the crazy" comes out. I would lump fundamentalist religious people into this category.

I think if one is able to introspect hard enough, it is possible for _everyone_ to realize that they're holding irrational beliefs at some level. Whether or not this is harmful depends on the norms of the culture, and to what extent one is willing to act on their beliefs or impose them on others.

I believe in crazy stuff--like batshit crazy stuff. I can still have a rational discussion, because I severed that part of my personality and crammed it into a tiny, fortified metal box inside my brain. I have found that it is still useful for writing fiction.

That is, for writing things that the remainder of myself, and everyone else in the real world around me, can recognize and know to be untrue. Because there is no way that raving lunatic in there could possibly know whether any of the things it shouts out could be true. Could it? It shouldn't really matter that it has such an eye for detail and a knack for explaining things that seem otherwise unexplainable in a rational world.

I heartily encourage you to not make any attempt to pry that box open. Don't touch the lock. Mind the warning signs. The crazy is inside the box. The rational is outside it.

I should probably stop talking to my crazy so much, but it's so much more entertaining than television. It really is an infinite source of amusement. I mean, the story about Devil's Tower being a fossilized tree stump left over from a previous epoch is just amateur stuff in comparison.

While there is something to be said for seeing things in a positive light, and accepting that which you cannot change -- the fact remains: these people vote!

They are a clear threat to rational policy making.

Also, their children are often victims of their irrationality, sometimes dying horrible and needless deaths for the sake of their parent's beliefs.

A quote from the flat-Earthers included in the article: "After watching this video, you will reverse your concept of forests by 360 degrees."

At least these people understand their audience's intellectual limitations.

For the record, I circumnavigated the world solo in a 31-foot boat (https://arachnoid.com/sailbook/). From direct empirical evidence, I know the earth is round.

Reminds me of the ol 'turn 360 degrees and walk away' gambit.
Not a flat-earther myself, but as an amateur topology enthusiast, it does not follow from your experience that the earth is round. Care to join me in a new splinter group? I figure the Cylindrical Earth Society to be the least-radical option, and possibly a common ground for many. /s
No! Join me in newest splinter of a splinter group: the Toroidal Earth Society.
I'm skeptical, having heard far more personal anecdotes about circumnavigating the earth as opposed to visiting those so-called "poles" or the "inner ring" as your group hypothesizes. Once you accept the torus, where do you stop? I can mentally map the earth to a genus one torus, absurd as that is, but your splinter group has its own splinters with proponents of genus two, three, and beyond! Where does the madness stop?
That's pretty sweet. I have a mild interest in boating. Would you say that it's a bad idea to mix a software engineer with a boat on the open sea?
> Would you say that it's a bad idea to mix a software engineer with a boat on the open sea?

Not if one's satellite navigation system fails and one is then required to reduce sextant sights to get across the ocean safely, as happened to me. I had a laptop on board and wrote a program to reduce my cheap plastic "backup" sextant's sights in a reliable and speedy way. I ended up with almost the same position accuracy from the sextant that I was getting from the failed satellite navigation system (this preceded the GPS era -- GPS is way more accurate).

So from my perspective, being a software person was a distinct advantage, and I assisted a number of other sailors whose non-cybernetic navigation methods would otherwise have gotten them into serious trouble.

You can sail around a torus.
It's funny how multiple people mentioned topology. But the simple response is that you just went in a loop on a plane, because you don't know how to navigate properly.

Of course, I believe you! I'm not a flat earther. But to someone who has already made the mistakes necessary to convince themselves that the earth is flat, it's easy to deny your proof. You don't have direct empirical evidence, you have the evidence that you went in a loop, plus a bunch of science that these people have crazy reasons for denying, and that science tells you that loop involved going around a sphere.

Good work at devil's advocate. Maybe you can help me with this -- how can someone be a flat earther in the absence of any evidence of any edge to the surface of the earth? What is the counter argument to this?
That one's easy ;)

Antartica is not an island continent, but an ice-wall that extends around the entire flat earth

Nobody has ever got a photograph of the edge because you can't go there, you're not allowed. The governments of the world see to that!

Creative! This reminds me of FreeCiv maps with the 'flat earth topology' option turned on. The edge of the earth must be long enough to encompass the earth. So the folks using that argument must imagine Antarctica as _huge_, though we can easily measure the coastline and prove their explanation impossible.
Ah but if you go there, you are obviously part of conspiracy and not to be trusted!

It's all delightfully solipsistic...

I'm not going to try, this example seemed easy, but I don't know if I have the knack for it in general. But my perspective on this is shaped by having read the Talk Origins FAQ extensively in high school. I don't know what I'd think now, but back then I was in awe of the creativity that young Earth creationists had in muddying the waters regarding the actual scientific evidence: http://www.talkorigins.org/indexcc/
> It's funny how multiple people mentioned topology. But the simple response is that you just went in a loop on a plane, because you don't know how to navigate properly.

Yes, plausible explanation, which partly explains how beliefs like this can persist. Ironically, an increase in mathematical and geometric sophistication can produce more convincing alternative models -- for those who want to defend the alternatives.

I have a sketch of a theory that rattles around in my head. I'm fairly sure I'll be pilloried, but what the heck.

It starts with a nation founded on faith and religion, of a group of people who are willing to kill and enslave based purely on things they believe but can't prove. They'll try like hell to prove it, they'll search up and down for the slightest hint of something they feel to which they can connect other tiny little other unproven dots to. It doesn't matter if YOU don't think it's true, it's MY religion and I believe it and YOU can't fuck with MY faith.

It continues on through a society full of advertisements that scream "the best!" "foolproof!" "most delicious!" night and day, from every corner...first from papers and billboards and then up through radio, tv and the internet. Even when demonstrably untrue and nonsensical, they're allowed to be propagated and repeated.

It reaches a modern day where political classes can literally almost say or do or vote what or however they want without fear of any serious reprisal or of the citizens taking half a minute to remember that they said/did/voted the exact opposite 6 months or two years ago.

This is true in the US specifically but also in varying proportions throughout the world, and moreso as our model is spread everywhere.

So basically I wonder if first we have been misdirected and advertised at and lied to for so long that a sizeable portion of those among us have actually lost sight of what's true reality anymore. Some of my family members I previously thought of as sane and rational have become so unhinged and irrational that if they suddenly came to me and said "the earth is flat and there are no trees" I might flinch for a second but otherwise would not be all that surprised.

I imagine we have simply developed a very refined understanding of how human understanding can be manipulated. These tools started as a means to control basic human functions (and the ability to live in large groups) and then were refined for political & economic benefit in the post-war period.

We're probably 'enjoying' a new wave of this development with persistent media and I imagine if the promises of AR/VR come to pass that we will see even more severe divisions between individuals/communities/countries understandings of what's "real".

Propensity to believe implausible stuff has always been common. But arguably situations get increasingly chaotic with better communication. And now we can have global-scale filter bubbles.
You're attaching the issue to the US (or maybe western society), when in fact this issue is inherent to humans as a whole.

People are able to create mental connections between things. They are able to see patterns and extrapolate. This is one of the things that separates us from most other species and gives us tremendous capabilities, such as the ability to examine the past for mistakes and plan things out for the future. It also leads to storytelling and culture - ways to rapidly adapt at a societal level rather than a genetic or behavioral one.

However, this capability doesn't have to be 100% accurate to work effectively - it only needs to be effective most of the time to provide a significant competitive advantage as far as survival. You can see this in any number of current or past societies, from small tribes to continental civilizations - beliefs and behaviors develop and become standardized/traditional, which are frequently a mix of useful/effective and pointless.

A simple example would be prayer - consistently, human societies invent higher powers that they ascribe control of various aspects of the world to and construct rituals around them, and regardless of the lack of evidence, you can find this is pretty much all human societies. The details, of course, vary widely.

In short, humans have never had a firm grasp on reality - we've already invented things and filled in the blanks with our own imagination, amped up our importance in the universe, because we're limited in scope as far as what we can interact with and control.

Today things are both better and worse than in the past - we have cultural patterns like the scientific method, which ideally gives us more reliable information than most prior constructs; tools that expand our ability to examine the universe around us, giving us a better idea of where we are; consistently better information transfer (spoken word > written word > mass-produced written > analog mass media > digital).

But at the same time, these things can be used to spread incorrect information just as much as correct; things can be cherry-picked, ignored, manipulated; logical fallacies abound; and, as ever, people will see the things they want to see to fit their patterns and beliefs, ignoring or deeming irrelevant the pieces that don't fit for them.

We know more than ever as a species and society; but individually it is completely beyond anyone's grasp to gain a solid understanding of everything we know simply because there is so much. We're relegated to trusting each other - and unfortunately, people don't choose who they trust based on how accurate those people might be, but on things like social relations, world-view match, and so on.

I am fascinated by holocaust denial and the people who think the moon landing was faked. Does anyone believe both? Do the people who believe those have any other historic events that they think were made up?

Most importantly (too me) would it be possible to start one of these on purpose? If you wanted to, what would be a good candidate?

I concluded that the atomic bomb is an excellent choice. I say there never was an atomic bomb. It was propaganda to prevent the US and Soviet Union from engaging in a disastrous WWIII so soon after WWII. And it was very effective but it's time for all the suckers to wake up.

I know you've seen the films. Special effects! Hiroshima/Nagasaki? Regular fire bombing that happened to get out of control because of favorable (or unfavorable) winds! Godzilla? Well that's more difficult to explain but I'm sure if we put our heads together we could come up with something.

Who's with me?!?!?

If you're going to deny undeniable fact, may as well go all the way crazy. I'm in! Let's work on that Godzilla problem though, that's the real hole in our theories.
Simple. The director worked with the Japanese and American governments to create a reason why the Japanese Emperor lost that didn't delegitimize the government. Who could fault a surrender after a "superweapon" was used on you?? Genius black ops on the part of the US and Japan! Then they create various movies propping up the idea. Turn Japan into America's R&D division for electronic development so we didn't have to educate Americans and could continue to dumb down the education system and keep the rowdy Americans in check until they were needed for the next war.
Ha! Get this. It's unassailable.

Godzilla... was just an ordinary human in a rubber suit, in a movie studio sound stage where scale models of cities and landscapes had been built. In later years, as film technology improved, the more detailed films of Godzilla were created with a CGI model, with the virtual skeleton and muscle movements derived from filming a human actor in a mo-cap suit. It only looks real because the animators are so skilled, and the actor is so good at mo-cap acting. It is in no way live footage of a real animal.

That's right. Godzilla doesn't exist. He never existed. He was always a made-up movie character. I bet you could get literally thousands of people to believe that. With enough gaslighting, I bet you could even get someone whose actual home was actually stepped on and burned by Godzilla to believe that it was due to an earthquake or tsunami or tornado or nuclear reactor meltdown or something equally farfetched.

genius. I think it really adds something that we make this case strongly. Like it would make normal sane people question whether maybe Godzilla did exist for realsioes!
Other notable historical conspiracy theories that have a surprising number of adherants:

- 9/11 was organized/enabled/allowed to happen by actors within the US Gov.

- Pearl Harbor was organized/enabled/allowed to happen by actors within the US Gov.

- JFK was assassinated by the CIA

- All history from CE 614 to CE 911 was fabricated by the Holy Roman Empire

Nos. 1, 2, and 4 are far more plausible than conspiracy theories like flat-earth-ism, holocaust denial, and moon landing denial.
1 and 2 are much harder to prove, since they're not about whether some big thing happened as much as about who orchestrated it, which is a much more ephemeral concept. We (mostly) all accept that some ships sank in Hawaii and that the World Trade Center towers are missing as of 9/11/01. It's what happened and who made it happen that are in question.

I'd say 4 is just as easily disprovable as flat-earth-ism: There are other, contemporary societies in contact with Western Europe who were also keeping track of time... unless there was an Eurasia-wide conspiracy (in CE 1000) to fabricate those years, the dates only line up the way we count them now. There are also well-established (and recorded) astronomical events that line up well with the commonly-accepted timeline (but that would take believing that astronomical events are predictable by science).

In all, I'd say it's much more likely that NASA pretended to land on the moon than that the century we think Mohammed lived in didn't happen.

EDIT: Misread my own numbering

The first three aren't parallel in my mind. Those people aren't saying 9/11, Pearl Harbor and JFK assassination didn't occur. they just have different, mostly unfalsifiable theories about why they occurred.
> I am fascinated by holocaust denial and the people who think the moon landing was faked. Does anyone believe both?

A work colleague of mine and otherwise very good friend does indeed believe that the moon landings were fake. It took some time until she started admitting that during our chats, and I have to say that I was at first baffled that she actually believed that they were fake and I've only recently stopped mocking her about that.

I also met a friend of a friend (man, late 30s, otherwise quite a great guy) who told me straight-faced that he believed that the Holocaust was not real, that the numbers were "exaggerated" or somth like that. I couldn't continue the conversation because I felt that there was nothing much that I could say, you cannot really continue that kind of conversation without calling said person an anti-Semite and it all goes downhill from there.

I'd be interested in that if it were just a critical mind examining how cognitive bias might have affected numbers and perceptions.

The fact that most of them are only that way about the holocaust argues otherwise.

Still I have to wonder- if you hate Jews why pretend the holocaust didn't happen?

I had a step-father who believed the moon landings were fake. He also thought cigarettes were healthier than chocolate and that Columbine was a false-flag operation to sway the public in favor of gun control, though.
>Flat earth insists on the primacy of direct experience (look at the horizon, really look, and try to see the curve) against abstract domination.

But you can see the curve... Have they never been to the ocean?

Yeah, but that's just because our eyes are round!
I've been to the ocean many times and have never noticed any obvious curvature. If it is visible, I can only imagine it's much easier for somebody who doesn't want to see it to miss it.

EDIT: I just Googled and it sounds like the planet's radius is big enough that, within the range our eyes can see, the curve is extremely subtle.

Notice the horizon. On a flat surface you should see until haze. On a clear day on the ocean you see a horizon.
I've often wondered why someone who believes the earth is flat can't explain why one couldn't see London from NYC. Presumably we could build a strong enough optical telescope to look at the city.

Or is it claimed that there's "too much debris in the air" to prevent this?

Flat-Earthers are actually part of a vast CIA conspiracy to distract us from the truth of a spherical Earth. They don't want us to know we can travel the Earth over the poles, where the Earth's magnetic field and radiation causes their mind-tracking technology to fail.
Not spherical, rather spheroid. Oblate spheroid.
That's another conspiracy propagated by the Imperfect-Spherists.
Just wait until you discover it's toroidal, but your perception of space-time makes it's appear spherical.
> I’ve always been mildly obsessed with the flat-earth truth movement, the sprawling network of people utterly convinced that...

I can't help but feel a little bad for anyone who believes that flat-earthers are genuine.

I've pretty much convinced myself that flat-earth groups are more like speculative fanfiction archives than churches. The people who come up with all of these theories and defenses do it because thinking about these things is fun, not because they believe it. And they feed the perceptions of true belief because that's fun too. And they form these little communities for the same reasons that people writing new fan stories about Harry Potter do, because it's more fun to do it with other people.

The author here isn't uncovering some secret truth about the world so much as getting suckered into the drama, feeding it, and providing further joy and incentive to the players.

And here I am possibly getting suckered into the author's drama. Maybe the author is just one of the players and doesn't actually believe that they believe.

I think if you spend an afternoon watching their YouTube videos, you'll come away feeling like they really do believe what they're saying. Certainly some of them are weaving elaborate fan fictions of reality, but many truly believe what they're saying. Part of it is a lack of education about the natural world, part of it is mental illness.
Quite a few flat-earthers really do believe it, and they're generally not dummies.

I've engaged in open-minded and friendly conversations with flat-earth individuals off and on for quite a few years. It's fascinating stuff; many are pretty chill and willing to chat if you go in with a positive affect.

I think if you graphed the total number of people who truly believe the earth is flat compared to the number of people who profess that just for 'troll' purposes, the latter group would be growing rapidly, and the former growing very slowly.

Why do I do this? Because the older I get, the more I realize that all of us, everyone, make a lot of choices every day that we think are based on logic and reason, but that are actually based on irrational experience and emotions. I think we tend to back-fill with logic and reason as much as we can.

Many people get more things 'right' than others, but what's 'right' is damn hard to know, isn't it?

This might seem like a wallow in all kinds of intellectual relativism, but it's really not. We should all strive for logical and rational thought and decision making, yet at the same time realize that we are all still fundamentally driven by forces that are quite the opposite, and that drive is largely invisible to us.

I've met someone who claimed he believed in the flat earth theory. I see no reason to believe he was misleading me. Not massively educated, not really interested in analytical games.

I've met people who believed they could communicate with aliens by meditating under pyramids made of steal pipes.

I've met people who believed that putting a crystal on a bottle of water will make it stay fresh longer. That they could charge batteries with their mind.

Not sure what kind of proof you might want to be sure these people really believe what they say. And I'm not sure how meaningful that statement is. I never thought they were playing the mind of fan-fic games you suggest though.

My observations lead me to believe people in general believe some pretty weird things.

I've begun using the term "epistemologically disabled" to cover those in the general class of crazy people that includes flat-earthers, anti-vaxxers, chemtrailers, climate change deniers (anthropic or not), "Obama is a Kenyan Muslim" republicans, &c. Because seeing this problem as a disability changes my response from contempt into one that's more sympathetic.
What I'm curious about is the population distribution of flat-earthers. I think it's pretty clear that some of them are trolls, having fun with a ludicrous idea; some of them are mentally disturbed (schizophrenics of one sort or another, I suppose), some fraction have exceedingly low IQs, some fraction have high IQs but are exceedingly-poorly educated.

But is it really just mostly trolls? That's the only explanation that makes sense.

> The particulars differ, but here everyone takes it as a given that a conspiracy reaching from your first schoolteacher to NASA to the metaphysical Beyond has deluded humanity [ed: emphasis mine]

Misusing 'humanity' to mean 'mankind' (or, if you must, 'humankind') is one of my pet peeves: humanity is the quality of being humane. Flat earthers don't believe that a conspiracy is deluding the quality of being humane (that phrase doesn't even make sense); they believe that a conspiracy is deluding mankind (or, again, 'humankind').

edit: add closing paren