San Francisco is neglecting to enforce existing laws regularly broken in the open by folks largely overlapping with the homeless population.
I've mentioned this before on this forum. At one point when I worked in the mission we watched daily a homeless encampment operate a bicycle chop shop in broad daylight from our second-floor lunch room. The police did absolutely nothing until it had been operating for well over a month. They would drive by occasionally, doing nothing more than slowing down, while a pile of stolen bicycles and bicycle parts sat next to the tents covered by nothing more than a tarp. We saw a constant flow of people coming with newly stolen bicycles and leaving with rebuilt permutations presumably to be sold on craigslist. They didn't even try to hide it.
Apparently the police stopped bothering to arrest people for petty crimes because nothing would come of it. The criminals would be immediately released back on the streets.
That has nothing to do with tolerating homelessness and some people living on the streets. We don't need to make homelessness illegal to arrest people operating a bicycle chop shop in broad daylight.
Sometimes I wonder if the city is deliberately neglecting to police crimes being committed in broad daylight independent of homelessness to further an agenda interested in criminalizing homelessness. If they can let things get so bad that everyone conflates homelessness with rampant uncrontrolled crime and destruction of the city, then it becomes much easier to garner support for such laws in a panic.
The police should do their jobs in at least enforcing the existing laws and we should be punishing criminals.
You could clean up the homeless problem in San Francisco pretty easily by simply enforcing laws and incarcerating criminals who happen to also be homeless. It's exceptionally easy when they're operating out in the oppen without even a roof and walls to hide behind.