I'm not a SF resident and don't understand this at all, can someone explain what happened here?
Of course, it was all just staged; they swept away the vendors, finished their photo op, and after they left, the vendors all came back.
I think the grandparent's point is that if they can't/won't even enforce laws that they actually claim to enforce, LSD use -- something the local government explicitly has not cared about for quite some time -- has already been unofficially decriminalized. I don't really agree with the overall premise there, though; without getting into whether this particular decriminalization is a good idea, leaving intentionally-unenforced laws on the books just leads to abuse. If particular laws shouldn't be enforced, then they should be repealed entirely.