Confidence and incompetence are a bad combination of traits in a person.
True. I first heard it when Anthony Robbins said it around 1990 or so. It really began to be a trait of people in their 20s around that time.
AOC types take it to extremes. They actually went into Congress thinking they already know enough about how to get support to pass legislation and delay opponents' bills---the first day there! Elbowed past Pelosi and the rest without a backward glance.
In business---or organized crime---they wouldn't last the week. Actually DC is a combination of both.