GHB is one of many date rape drugs that people also consume recreationally, and yeah i'm not sure why they love it!
ket is definitely the drug of choice in the SF social scene, and wrt psychedelics I think there is not a lot of care put into them / some really childish perceptions of them, the Michael Vassar / Leverage situation is a whole thing but assuming it's as described, ie he was encouraging people to use drugs to 'hack' their own brains it creates a really bad situation wrt consent
honestly i think there's just a lot of untreated mental illness which gets idealized, adding psychedelics on top of that is not a great idea