You've got it all backwards. Adults are the ones who think they know everything. Don't mistake confidence for arrogance. If you raise a kid right, then they'll confidently do dumb shit, knowing they'll learn from it and you'll keep them safe. That's healthy development. But you look at the adults who never take risks, never consider different ideas, refuse to learn tech or politics because they think they won't get it. That's low self esteem, but it's also a form of arrogance. The arrogant belief that you are already the best you can possibly be. That you have no growing left to do. Even if you think you're the dumbest person alive, thinking you're the smartest version of yourself is arrogance.

It's all the Dunning-Kruger effect. We are cursed to continually fail on the side of you don't know what you don't know.

I had this idea in my teens that we really needed a common sense brigade. Small groups of people jury style that would just go from place to place and say hey that's stupid Don't do that. Because I could see right from wrong I assumed that we just needed a bunch of people that could also see right from wrong to go around and lead the idiots to reasonable decisions. It was very easy for my 15-year-old mine to see black and white everywhere. It's all good versus evil and smart versus stupid.

Many decades later, I know grasp that most of the world's problems are because people tries to fit everything into black and white.