Homeless people might appear to be funny. Grooming is not high on their list of things to do. They wear bizarre combinations of tattered clothes. Sometimes they shout into garbage cans at nothing at all. Pushing grocery carts full of cans and rotten scraps of food -- they hoard to make themselves feel safe and like they have a home. And while they look funny, smell funny and act funny, most of them are mentally ill, and that...