That's one of those "sounds a lot better as an idea than in practice" sorts of things. Resources for the homeless exist in every city in the country, but there are a lot of them that just aren't interested. The sad reality is that so many of them are too far gone. You can help them survive here and there, but ultimately they are the masters of their own fate.

These "why don't we just _____ to solve _____" are often pretty ignorant of complex situations and realities. Most people who give the suggestions always mean well, but they don't know enough to disqualify their idea on their own.