Go ahead, take a 30 minute walk just north of The Mission. Turn a corner and you'll find a homeless dude standing with a vacant look on his face and pants around his ankles, letting his penis sway in the morning sun.
Turn another corner and you'll find someone shooting up with reckless abandon.
Turn another and you'll be an uninvited witness to a homeless dude verbally and physically assaulting someone for no reason.
LA, NYC, Boston, Chicago, Seattle, etc -- at least these have their size to distribute the problem, SF on the other hand is so small and its city council so progressive that there is a critical mass of it all.
http://www.sfexaminer.com/sf-reaches-400k-settlement-proposa...
Californians just don’t want their cops regularly as policy beating homeless people and arresting them for existing.
That’s why other downtowns don’t have homeless, they’re swept aside.
But, to your point about being too liberal, I've seen some of the most disgusting things ever in Powell BART station, and when the police try to kick people out, they get too many complaints and have to back off. So we all have to suffer.
In fact, it's not the worst based on the data: https://www.seattletimes.com/seattle-news/homeless/is-seattl...