I said the same thing about Flat Earthers until I sat and had a conversation with one.

There are people who will believe anything if it's spoken with enough confidence or fits their world view. Doesn't matter how crazy it might sound to you or I, it sounds real enough to them.

Sometimes it's simply undiagnosed mental illness, someone legitimately disassociated from the world who, for whatever reason, can't get help.

Used to be a dude who hung around the DC Metro stations, talking about how white bread was filled with chemicals designed to poison black people. He could go for hours how it was designed to keep ghettos poor and stupid, but was good for white kids, so they got away with it.

He seemed to genuinely believe it, or was one hell of an actor with the passion he'd put into it.