It is the ego and education hand in hand. There is so much false logic all around us that people are adopting these logic false logic principles by them self's.
https://yourlogicalfallacyis.com/
https://en.wikipedia.org/wiki/List_of_fallacies

They defend they conclusions because nobody is better then them ,nobody is smarter. Who is the most important person in the world me, me, me, me
And there is a lot of people using same false logic fallacies.
Then tribalism comes to the stage. Belonging somewhere , feeling that you are accepted , and there you go MODERN SOCIETY