I don't think it is unfounded at all. Over the years I've known many victims of psychedelics. There's a guy in my apartment building who lost his shit on a bad

I don't think it is unfounded at all. Over the years I've known many victims of psychedelics. There's a guy in my apartment building who lost his shit on a bad acid trip 10 years ago and hasn't been a productive member of society since then. I've used them, but it's really impossible to say whether or not I have suffered ill effects. No control subject. The author of the original linked essay points out that they produce large permanent changes to personality. That's a really big deal, and potentially very bad.