I wonder if purity culture didn't appear more in the Harry Potter fandom because the books were so forbidden for a lot of very religious folks. Reading them was a form of rebellion but they did come to the fandom with a lot of other hang ups about relationships and sex and one small act of rebellion doesn't undo a lifetime of that kind of indoctrination.

I find as I get older I have far less time for fandom drama so if I see a lot of infighting in a fandom space I just don't want to be there.