One thing that I think is missing from these discussions about the homeless in SF is: many of these people do not want to be rent-paying members of society and even if there was housing for them, some might still prefer their current lifestyle. Many people still view that lifestyle choice as unacceptable because it challenges the typical goals of someone working hard for a 'better' life. I don't think the question should be 'how do we get these people to participate in society?' but 'why don't they want to participate and how can we accommodate these alternative life choices?' Otherwise any progress made would benefit those who want to see the streets cleaned up and not necessarily those living out there.