I’m looking for books about the psychology of conspiracy theories and fringe groups

I’ve watched Dan Olson’s videos on NFTs and the GME/apes thing and I found his dive into the psychology of the groups he talks about to be extremely interesting. Can anyone recommend me books of a similar nature? I’m specifically looking for material that dives into how fringe groups think and maintain a worldview that’s so obviously absurd to outsiders.

by Kindlypatrick