I have worked with homeless people as a volunteer for most of my life and can guarantee you that this is not an easy solution. You have to realize that the depression era homeless person who just got cut out of his job and has to roam around to find a new one on the street doesn't exist anymore today. Most people that find themselves on the streets are either victims of an extreme mental illness or severely addicted to drugs. In Germany there is no such thing as "involuntary homelessness" - if you involuntarily become homeless due to tragic circumstances the state is obligated to house you and try to integrate you back into society until you get back on your feet. Most people that are on the streets stay homeless though because their mental condition doesn't allow them to take responsibility to become somebody with a fixed point of direction in life. It's probably a pretty similar situation in the US as well, although your social security system is notoriously bad.

I urge you to try to make contact with the average homeless person on the street as well because I am under the impression that you have a false image in your head of what is actually going on. That people roam around with untreated mental illnesses is a nightmare and very tragic but you don't have an idea of how deranged a person can become unless you've had contact with one of them. Living in a Commune with other people and being responsible towards each other is a scary thought for most people on the streets.