The more you know, the more you know you don't know.
Corollary: the less you know, the more you think you know.
This is why teenagers are know-it-alls.
That's by design. It is advantageous for all of us that the idiots do the dangerous things we have doubts about. Then when things aren't as dangerous as we calculated and the idiot survives, we get free data. Never risking the true intelligence among us.