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Correction: these people were smarter than you, and they may have at some point recently come to understand that they couldn't make a safe tourism business out of this sub.

That would be hubris

Foolishness

Conditional Risk https://xkcd.com/795/

Elon Musk effect.

Dunning-Kruger effect.

Did you know the Dunning-Kruger effect isn't real?

https://www.psychologytoday.com/us/blog/how-do-you-know/2020...

I’m not really convinced. If everyone is a little overconfident (in the sense that they think they’re above average) then the least competent are indeed the most mistaken about their relative competency. Which is (I think) what most people—at least ones not trying to use it as a debate tactic—understand Dunning-Kruger to be.