[Dutch Boy]

I had never heard of the Dunning-Krueger effect before. It matches what I have been using for a long time. My version was that some people are so dumb, they don’t know they are dumb. I didn’t realize I was clinically correct.

[diatomite]

It explains a lot of what is happening in the US today.

[Rebelbase]

Also, this seems highly probable:

Anosognosia, also called “lack of insight,” is a symptom of severe mental illness experienced by some that impairs a person’s ability to understand and perceive his or her illness. It is the single largest reason why people with schizophrenia or bipolar disorder refuse medications or do not seek treatment.

https://www.treatmentadvocacycenter.org/key-issues/anosognosia#:~:text=Anosognosia%2C%20also%20called%20%22lack%20of,or%20do%20not%20seek%20treatment.