Since the victim lived in Miami most recently, a lot of people writing about this case commented about crime statistics and it seemed to me that based on the data, Miami is a more dangerous place than San Francisco, with more murder, rape, assault, etc.
I think where to draw the line is this "undesirable place" business. That's highly subjective, judgemental, and can cause you to lose sight of a lot.
I think you've hit the nail on the head there: "undesirable place" can come from a lot of reasons. Sure, I think SF has become more undesirable due to the increase in visible homeless population (visibility most driven by the mentally ill and addicted, as well as the tent encampments), as well has rampant visible drug use.
But I think the belief/feelings that this translates to much worse crime is just not correct. I can sympathize and agree with the idea that homeless and drug problems makes SF less desirable, but I don't think it moves the needle that much on safety and crime.
It's interesting that you say that, because I had no knowledge of the relation to Miami (it's tough to tell what you meant by that comment).
The only reason I said this, is because I was there for Miami Music Week, and they had multiple shootings two years in a row. It also has a bit of a reputation from the "cocaine cowboys" years. Honestly, the city had a bit of a "feel" to it, but it also seemed to have a great amount of character.
I'm not really passing judgement myself. I live in a place that many people would call "undesirable", and it does hurt... it's also not really fair, because it's a beautiful city with rich culture heritage, and continuing culture.
However, we have lots of shootings here too, and I understand why people are a little apprehensive.
I think where to draw the line is this "undesirable place" business. That's highly subjective, judgemental, and can cause you to lose sight of a lot.