I agree with your sentimen. I'll use a favorite quote of mine as well
Man is not a rational animal; he is a rationalizing animal.
Robert A. Heinlein, Assignment in Eternity
Whether they know the evil or not, they will go out of their way to to find a way to justify it. That's why those scare news on networks works so well. It gives them "permission" to accept something they wanted to believe,and now they have "proof".
Moreover, it's part of a core issue many in this society fall into (all across political spectrums) : it is shameful to be wrong. And apologizing makes you "weak". Even if you do change your mind, you can never admit it. And some people will be on their deathbed spouting a belief they changed on rather than "showing weakness".
I don't know how and if we can change that cultural element. That seems deeper than any billionaire regime.