Wow, just WOW.  I haven't heard anything this callous since I stopped talking to my Tea Party brother.  We are all living creatures, a species, a society, and we should be looking out for each other.  Yes, the homeless, the addicted, and the mentally ill ARE a difficult nut to crack.  Underfunded programs and closing mental asylums has had a devastating effect on the homeless population.  Involuntary homeless people are not criminals or addicts.  Being homeless is not a crime.  Not every homeless person wants to get off the street, and not every addict can be saved, but we at least need to try to help the ones who really want to be helped.   
I personally have been taking homeless youth into my house for the past six years. It's rough, yeah.  I don't have any nice furniture anymore, and there have been a few holes in the walls, but I've turned around about 50% of the guys who have lived here, and the experience has enriched my life,  
I continue, and would do it all over again.