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.
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.
I am smart enough to know that I'm too dumb and ill-equipped to make a safe tourism business out of a homebrewed submarine.
These people are smarter than me, but too stupid to know that they aren't smart enough to make a safe tourism business out of a homebrewed submarine.