I think the practical rule is if you don't want to get stabbed don't go to areas where stabbings happen. And generally, this tends to be true almost everywhere

I think the practical rule is if you don't want to get stabbed don't go to areas where stabbings happen. And generally, this tends to be true almost everywhere in the world. The fact that this happens in an area not particular high in crime belies that rule. Even on HN, when we talk about crime in San Francisco the defenders will normally point out it's just a few problem locations. But how do you respond when violent crime emerges outside of those locations?