This is flatly untrue and bad advice - there are absolutely areas of San Francisco where you run the risk of being the victim of physical violence. Some people will be comfortable living in that kind of environment but many won't, and suggesting that all of San Francisco is uniformly safe is irresponsible.
> I lived with 3 roommates to save money, I sold my car, you won't get stabbed anywhere in SF (so live in the sketchy area it'll get nicer each year).
I'm not willing to test that theory and there's an inherent value to not thinking about getting stabbed on a daily basis.
> My rent was $1,200 a month, a lucky find.
To live with 3 other people in the sketchy part of town? Yeesh.
Even if that's not you, you have to realize that everyone else needs that option if we're going to have a functioning community.
Now consider: what would you do if you were already married and wanted to do this? (Meaning, move to the Bay with your SO, not leave them behind.)
I lived with 3 roommates to save money, I sold my car, you won't get stabbed anywhere in SF (so live in the sketchy area it'll get nicer each year). My rent was $1,200 a month, a lucky find.
Now don't get me wrong I hated living there, no girls, homelessness everywhere smelled like garbage, and a self-obsession that pretended to be health-minded but was really wealth-minded ($9 juice OMG).
But the earning power change by having lived there is night and day. To have companies people have heard of on your resume goes such a long way.