I don't live in the US, but it's weird: downtown San Francisco people tend to look down on Oakland, but every time I've been, San Francisco is unique in having human feces on the streets. In Oakland: there's a bunch of parks, a hacker space called the sudo room, a bunch of JS related companies included npm Inc are headquartered there and the last JSFest was there.
Please do not try to understand this through such a narrow lens. San Francisco has human feces because it is one of the only cities in the USA which has not completely criminalized homelesness, because there are a lot of services there, and because once people decide that San Francisco is home, they really, really, really do not want to leave. First of all, there are plenty of human feces in Oakland, but again, let's…
Getting offtopic but: Holy crap. Talk about cultural differences. The system in my nordic wellfare state makes sure people capable of renting a house and going to the wellfare office will have at least minimum accommodation (without criminalization).