That's interesting... you suggest that the homeless populace should be allowed to live their lives how ever they want (they should be left alone, as you put it) yet I'm not to be afforded that same privilege?  I want to eat lunch on a bench in the park blocks--something I used to do just 3 short years ago--without being hit up for money or watching the crowd of dirtbags gathered there urinate/defecate in the trees.  Or blast their choice of crap music for the entire block to hear.  How about they leave ME alone?  Is that too much to ask?  
Point is, we live in a community.  Homeless and want to be left alone?  Move to the middle of the woods somewhere.  But if you want to remain homeless and enjoy the benefits (re: handouts) of living in a community, then you don't also get to enjoy the freedom to run roughshod over the other members of the community in which you reside.  Respect is a two-way street, and being homeless doesn't exempt you from having some for others.