Most families in SF either have been there for decades or do in fact make 150k/yr. It's not being rich - it's just the local standard. This is the mark of a successful city (even though in the process culturally a lot was lost unfortunately) There is a small section of the city that has crime. That pretty much goes for any large city - and it's tied very closely to the city's efforts to help disadvantaged people.

If SF really wanted to get rid of the homeless and crime they definitely could with some NIMBYism. They'd shut down all the low income housing and stop helping the disadvantaged and increase arrests.

Context: grew up in SF. don't live there anymore.. but i don't recent the changes to the city. Life moves on