What do you mean, what about autism? It's a problem more important than homelessness. Having a home is not a physiological necessity, having a shelter is and only in adverse conditions (note that clothing can often do the job).

Also, 'Most homeless have mental problems' confirms the sentence you quoted. You're either intentionally misunderstanding it because you think I'm a mean person or, as it also seems, you have a poor understanding of English. Having mental problems that result in homelessness have also resulted in an inability or distaste for adapting to society as you, the government and everyone else demand people have residences. (Edited to remove a stray period and add a newline if it lets me. I'm having a formatting problem.)

Edit again: It's unacceptable to go around accusing people who make statements you disagree with trolls. In these instances, you're often wrong and you look like a fool to outside observers(who don't also do it habitually).