Why don't you want to believe what is manifestly true?

I'm sorry if I was unclear in what I mean by 'don't want to believe it.' I do want to believe things that are true...therefore, if it's true that humans are more moved by social consideration than reason, then I want to believe that. I don't like it, but pretending it's not true won't change that. But if I had a choice between living in that world, or moving to a world where humans were more swayed by reason than social consideration, I would pick the latter. Just like I'd pick a world without human trafficking and sex slaves in it over a world with them.