Just a thought: can you imagine that there may be many completely different ways you could think, all of them "sane"? That the patterns of thought you take for granted are mostly there by chance? Please take a moment and think before you answer.
Because if you can't, that would explain your reaction. GP found out something about himself by using LSD, and that something happened to be important enough that it changed his life. Why is that such a hard thing to imagine?
There are pills and there are pills. For my uncle 40 years ago, "just a pill" saved his life (penicillin). There are many pills that could kill you. And apparently there are pills that can change the way you think, and at least for some people this happens to have major positive consequences. Why is this by default evil?
I share your concern about MDMA use for therapy - but I don't think we should throw away the baby along with the bathwater. Drugs are extremely dangerous, especially for young and/or uneducated people, because they _work_. They have real, consistent effects, and if you manage to align those effects with your goals, good things happen. But if you don't... and this is why you usually have several horror stories for each successful one. Still - I think there is a lot of potential here.
My particular experience is of much smaller scale - a few months ago I found out that occasional melatonin use can fix my sleep schedule long term. Not a big thing, but I see it as one battle I've won with my genetics. And that's a good thing.