>[1] That is to say, nobody that isn't mentally ill or detached from reality.
I too hate to nitpick, but...unless we're taking a very literal view of starving, as opposed to a constant struggle to feeding yourself, you should check out the percentage of SF schoolchildren on subsidized lunches or perhaps spend some time among the homeless, particularly homeless youth. I can assure you there are plenty of people going hungry in SF.
I suppose you are correct in that no one is holding a gun to their head though, just a case of bad luck I guess.