It seems like you're making assumptions about the reasons that many experiment with psychedlics to begin with. In my case, I tried the anti-depressant route for years to no avail at all before ever experimenting with any alternative routes. At best, psychedelics can provide people with the equivalent of years of therapy condensed into single afternoons. And I doubted that quite a bit that before I experienced it myself.
That isn't to say psychedelics are cure-all drugs or that they can help anyone who's struggling, but it's no longer scientific to say that these drugs don't offer people very real benefits. There are just far too many cases to dismiss at this point of poeple overcoming years and years worth of mental disorders through these substances. It's a phenomenon which has been studied under controlled settings.
It's hard not to take some offense to this idee that I'm somehow making the world a worse place by having taken my mental health into my own hands after years and years of being failed by standard psychiatric medicine. For anyone who's been helped by these substances, it can feel pretty hurtful to just say it's all nonsense.