I do think that there is some sort of mental aspect to it for a lot of people though. Not like mental illness exactly... but I know a flat-earther and his life is sort of a stressful mess. I think that this explains for a lot of people why the world is fucked up and their life is not going the way they wanted. If everything else is messed up, it surely isn't them doing anything wrong. It feels like sort of a coping mechanism. I'm sure it's not like this for all flat-earthers, but I only know one.