Richest city in the richest state in the richest country in the world and we can't even provide a place for people to live. It's a failure at every level, there are too many culprits to list.
Aside: I thought it was a great touch that in this article each homeless person pictured was mentioned by name. Humanizing these people is something we can all do without spending a penny. If someone stops you on the street asking for a dollar, at least have the courtesy to look them in the eye and politely decline. I've had a number of people thank me more forcefully for that small gesture than actually giving them money (of course, give if you can!).