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Did anyone catch the horrid pie chart "Figure 10"?

https://imgur.com/xmUrTbg

Think about it, someone's job was to produce this report and they took clip art of a pie chart and wrote text over it.

Good enough for government work I guess.

That's a Venn diagram, not a pie chart.
are you kidding? maybe you aren't kidding.
I wasn't kidding, and yes I mistakenly said pie chart instead of venn diagram. Unfortunately, they are incredibly misrepresenting the percentages.
But what’s the denominator
I don’t think it’s remotely controversial that most violence is committed by young men. Most people in the world and in history would laugh at me for stating this, it’s so obvious.
Some interesting stats:

> In 2017 there were 30 active shooting in the US. Largest every during 1 year period. (Not sure what the definition is of active shooting)

> No demographic trends except for gender. Noteworthy absence of violent criminal history in overwhelming majority of adult shooters.

> 88% of shooters 17 and under "leaked" or revealed clues that they were going to cause harm. One shooter talked to a gas station clerk about "killing a family"

> 30% of shooters create a legacy token (manifesto, etc.)

> 35% owned a firearm that was purchased prior to planning the attach. 40% purchased a firearm legally and specifically for their shooting.

> 89% of shooters had concerning behavior noticed by others. Their percentages get weird and add to over 200% at this point, but it looks like the majority of these are reported to either non-law enforcement authority, family, or law enforcement.

The gist of the report is most shooters show a lot of concerning behavior and can't effectively cope with it. Most people deal with stressors in a healthy way, but shooters experience a lot of stressors and can't deal with them effectively. Most have a primary grievance, or main thing that pissed them off (mostly work or school). Mental health appears to play a smaller role than you'd expect, the environment plays a huge role.

  Their percentages get weird and 
  add to over 200% at this point
That's because you're treating that stat as an either/or condition, with an implicit heirarchy, but it's possible for multiple observers to report to eachother.

It doesn't follow a chain of Law Enforcement report > eclipses > Other Authority report > eclipses > Family report.

It can be any and all, and one cascading to another. So the stats overlap naturally, and cannot be summed from their silos.

>> Mental health appears to play a smaller role than you'd expect

For some traditional, clinical definition of "mental health" maybe, but to go on a rampage just because of a victim complex has to be a mental illness in itself.

Put another way, most of us do get pissed off at things, or treated unfairly from time to time, but we don't go shooting people. Someone who does that definitely has more than a few screws loose in their brain.