https://www.fisheaters.com/srpdf/Dietrich_Bonhoeffer-On_Stupidity.pdf
Interesting, I hadn't read that before. I do believe it is a moral failing too. Stupidity is cowardice. You pick one lane, one side, and then stick with it and stick your fingers in your ears to any contradictory evidence. Some people do this quite young and never change, and some people astoundingly start to do it in their 50s. That sort of mental rigidity makes no sense to me. We need to give these people a massive dose of shrooms and see if we can shake things up.