True. Such backwards "Venn diagrams" are actually pretty common. See also, on this same site, "Children Dangerous Things", "Smalltalk", "Royal Affair", and probably others.
It's not necessarily the other way around. Sometimes errors occur for those two reasons, sometimes they don't. But yes, the diagram is making incorrect assumptions.
4 comments
[ 2.4 ms ] story [ 15.5 ms ] threadMost of the diagrams on that site aren't Venn Diagrams at all - some are just...gibberish.