Reply #5: Because it is scary

[LynzM]

If they believe that things are ok, they don't have to face the scary reality that the world may not be a nice place, that people don't play fair, that they are being lied to. That's a scary thing for a lot of people to confront, and they will actively avoid things that force them to contemplate that possibility. For many people, it's akin to the suggestion that "God may not exist" or "God may not exist in the form you think"... too scary to even think about!