I have no idea if this is true, but it may be that a community of neighbors that knew Alex well would have been less likely to call the cops, to give the police more information about his mental state, etc. and that those measures would have saved his life.
"Class warfare" is an apt term. Wealth is only a part of it.. this is the Old San Francisco (Hippie/Transient/Outcast) class and the New San Francisco (Techie) class. I'm a part of the latter (and live on the edge of the Mission and Bernal Heights). I'm part of the problem. But, I think I can also be a part of the solution.
There was a group dedicated to solving these problems called EngageSF. They met and discussed at local mission restaurants. I can't seem to find any information on them now, though. http://missionlocal.org/2014/02/new-and-old-residents-engage...