This is probably a "propaganda law" to appear progressive while actually not doing anything at all except wasting ink and breath.
There was some quote with her that her district "went to shit during her term" and she seemed confused as to who was responsible...
Prior to Prop 64, we had a lowest priority ordinance for cannabis and it was a useful tool in defending our medical dispensaries.
People also have a tendency to get charged with possession when arrested for other things, even a traffic warrant or case of mistaken identity.
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 If particular laws shouldn't be enforced, then they should be repealed entirely.
https://sfgov.legistar.com/View.ashx?M=F&ID=11095427&GUID=46...
I think it is useful because it provides a fairly compelling and surprisingly specific list of justifications.