You are trying to argue on the basis of truth. I can accept the truth of your statements, despite it being irrelevant to the politicians who ultimately drive regulation. The politicians do not see truth, they only see their next re-election campaign. And since there's more political capital to be reaped, right now, from being anti-drug, then there is in supporting a new drug whose industry hasn't been built out yet, we won't be seeing psilocybin decriminalization, much less legalization anytime soon.
The same mechanics are at work in the current push for cannabis decriminalization and ultimate legalization. It takes the building of a tax base in order to get politicians to take the cause of cannabis seriously. Political economics neatly explain everything about the world we live in.
We already have plenty of regulated drugs which are used recreationally. Adderall, narcotics. You're saying psilocybin isn't special compared to other drugs. You'd be right, except for the fact that there isn't already an industry that exists to cultivate and bring psilocybin mushrooms to people, simply because anyone can go out and pick them themselves. There already was a cannabis industry before legalization, albeit an illegal one. Where is the illegal mushroom business? It's just random people doing it for side profits. Nobody's getting rich off of it.
Because nobody can get rich off of it, there isn't a political economic reason for legalizing it. There might be a public-interest reason, but that means the public has to actually generate more political capital than the anti-drug crowd generates from saying it's horrible in order to get it legalized.
I'm not saying nobody can make money off of psilocybin or that research can't be done. I'm saying that because nobody is already getting rich off of it, its political heft is forever going to be limited to 'mere' public interest.
Cannabis required a public-interest campaign before it could be regulated in one state, because the existing black-market industry had a vested interest in cannabis remaining illegal. Once the regulation enabled taxes, now we're seeing more regulation and legalization.