[Sohakes]

The first article is really anecdotal and there are a lot of other explanations, which the commenters talk about.

Also, the illegality of LSD makes it so regularly people use something else thinking it's LSD. Part of the bad problems (such as HPPD) related to LSD usage could be caused by something else. Could also explain why it seems mushrooms are safer.

But it could also be that hallucinogen usage make people weird, yeah. As you said, we don't really know yet. I'm curious and really hopeful.