> 'Legalizing hard drugs' is kind of a theoretical issue because I think it's hard for us to contemplate what actual widespread use would look like

You're conflating "this is now legal" with "lots of people will start using".

Aside from that point, I think we can make an educated guess about what will happen if you extrapolate even a little from countries where they are decriminalized. It obviously doesn't map one to one, but that's a far cry from it being so hard to imagine it's basically undoable.

Thirdly, you're talking about psychedelics and suddenly it's about all hard drugs. That's veering way off topic.