I've never lived in the Bay Area/SF so I can't comment on the problems there, but I have lived in London for the past few years.
I volunteer extensively with the homeless, and I haven't seen a fraction of what people describe in San Francisco, or anywhere near the level of antisocial behaviour or crime. Every week I'm serving food on the streets for at least a few hours; I've never once been threatened with anything other than words (and even then maybe twice with words?), never seen needles lying around (co-volunteers have, not common though), and never seen human faeces on the street.
I'm not saying that it doesn't happen or that people who write about them are being untruthful. However, I do wonder if it is the extreme events or experiences that get written about and aggregated into news.
Please stay the course and let them have their “reality”.
I have been taking the Caltrain for work in the past decade, sure it isn’t the most ideal or perfect railway system in the world debatably but it sure is the workhorse of a bustling population that doesn’t get as much praise for doing it’s job.