I think it's a really common form of irrationality (or cognitive bias?). Antivaxers, 9/11 truthers, moon landing skeptics, Holocaust skeptics, etc. are the same way. I think part of the appeal is that it's more comforting for them to believe in BS than live with the existential angst of the uncertainty and the unknowability of so much of life/reality/other people, but for whatever reason they can't see that motivation within themselves.