My petite SO made the mistake of parking in the wrong parking spot outside a verizon store next to Tenderloin and a homeless person chased her around our car trying to stab her with a screwdriver. In the middle of the afternoon on a weekday. And because it's sf, a couple guys saw what was happening and crossed the street to avoid getting involved, and the useless sf police took 8+ minutes to show up.
SF tolerates street trash acting up and acting out in ways real cities -- eg nyc -- simply don't.
I get off at the civic center bart station and coworkers are regularly worried about their safety.
I don't know what the solution is, but I don't care about them. It's fundamentally unreasonable to expect people to be unsafe walking around sf in the middle of the afternoon.