Please don't state your speculation as an understood fact - afaik there is no published literature that has controlled for parasites and I know the article from

Please don't state your speculation as an understood fact - afaik there is no published literature that has controlled for parasites and I know the article from scott alexander you're referencing here as he was the one who came up with the hypothesis. Let's not act like the parasite idea is more than an untested hypothesis though.