You shouldn't presume ignorance from people who disagree with you. It's delusional.
IMO, Dunning and Kruger drew unsupported conclusions. The effects they observed were not innate to the subjects they studied, but a result of a skewed PC feedback cycle which disallows honest responses to people's actual levels of competency. And, in PC form, they refused to acknowledge the true meaning of their research in order to protect that PC system. As a result, by assuming PC feedback is accurate, they concluded that the bloated self-estimates it creates is a reflection of the subjects themselves, rather than the result of the socially demanded erroneous feedback cycle.
The study is therefore itself PC garbage. A perfect GIGO example, in fact.
Actually, their study didn’t get into why the students’ self-assessments of competence were skewed. It could be from many reasons - social stigma of pride for the competents, embarrassment for the incompetents, incompetents’ inability to think logically and impersonally, or, your favorite, PC ideas about equality of ideas, to name a few.
They did say that incompetent people seemed to be much less able to accurately judge their own and others’ competence.