"I left SF 1,000 years ago, it's awful! I know, because I haven't lived there in 1,000 years!"
and
"I'll never move to SF, this is why! I know it's awful, because of the news!"
Not saying SF doesn't have problems. I don't live there, so I don't know! I do know that I live next to some cities that have similar or worse reputations, and I also know those reputations are overplayed.