Historically a city would be run with order in mind but SF no longer is. It’s a lawless place without defined borders of what’s safe and what’s not. If SF could clean up its act then maybe it would be different. But it’s the same reason as the 1970s when parents in cities began having to shelter their kids more. We’ve just allowed to streets to be taken over by the mentally ill, drug addicted, and creeps and everything that comes with that.