I don’t agree. There are many people that are neither psychopaths (inborn) nor mentally ill narcissists or sociopaths, have a good childhood (good enough - no one’s parents are perfect) and are still assholes.

You know why they are this way? Stupidity is the main reason. No matter how „intelligent“ the non-neurodivergent assholes appear, they are usually not smart. They just think they are and shun and damage anyone who disagrees.

Small edit: forgot to mention that the stupid assholes I am talking about are usually pretty well-adjusted. You meet them everyday, everywhere, and will not recognise them.