Dunning-Kruger didn't even discover what they claimed to discover. They're just another self-hatred, "check your enthusiasm" psyop against self-confidence and positive thinking. Psychological poison of the type that is literally shoveled at white college students nonstop to create and maintain modern liberalism. Teaching young people that giving up is facing reality.
And that is why they support Bernie.
And the teachers of the poison support Hillary.
Dunning and Kruger wrote a great paper. You should read it. It explains a lot in academia and management.
A quick version says incompetent people believe they are much more competent than they actually are, and that very competent people believe they are slightly less competent than they are. Because of social pressure, this leads to poorer ideas becoming more acceptable to more people than would be the case if pure logic ruled.
If you think about that, then the support for bad ideas, especially evident in this election year, is more understandable, although more frustrating.