and even more crazy, those who know the least think they know everything and spend a bunch of time telling everyone what to do and how things work.

There was actually a study showing the two kinds of people who had the most confidence in their opinions were the subject matter experts and those who knew almost nothing.  Those who knew almost nothing had no idea how much they didn't know.  As people became more and more knowledgeable, they rated themselves lower and lower until you got to the most knowledgeable because the more they knew, the more they understood how much they didn't know.