The question I find intriguing is not the logicality or otherwise of a set of beliefs, but their functionality.  Why is it in someones interests to believe (say) that science is all a conspiracy.  I can see why climate change deniers don't want to have to give up their SUVs, but belief systems are ,ore difficult to explain on those terms.

The importance of wanting to beling to a tightly knit group - ideally contra-defined to a hostile world will obviously appeal to a paranoid mindset, but it doesn't explian the content of those beliefs that the group hold dear.

notes from no w here