They’re not homeless. They are bums. There is a big difference.
The problem with building more psychiatric institutions to house those that are homeless, drug addicted or mentally ill, is that you them must hire more government workers who will be empowered to determine exactly who should be sent to these institutions.
Some good comments here. It should be obvious that homelessness has other root causes, simply ask why (rhetorically) there are homeless people in frozen northern cities? They would all migrate south if it were a genuine housing problem.