While I agree one can't have too much affordable housing and sensibly-priced rental units etc, there are actually homeless people who really can't seem to cope in any kind of accommodation and either have to be evicted, wander off or start to 'sofa surf' then rough-sleep. I have met some in my contact with prisoners. They maybe mentally ill, or so addicted to alcohol or drugs that they simply can't handle being in a house or flat. They need help, psychologically and socially, in special units where small numbers are guided by a resident mentor. They need compassion, understanding and much patience, not readily found in today's world.
I have also seen in our area groups of people who seem to be in families, and possibly of Romanian, Lithuanian etc origin (certainly Eastern European) who have migrated here to seek their fortune and sleep in odd corners of the parks or under overpasses. They probably aren't eligible for council accommodation, or must go on some sort of waiting list.
It seems inhumane to expect them to 'live' outside like that, but I don't know how one could help them.
One prisoner I tried to mentor was offered a small 'studio' council flat on his release, and promptly turned it into a drug den, invited a whole bunch of rather scary people to kip on his floor and filled the entire place with drug paraphenalia. The endless stream of dealers who traipsed up and down the stairs caused the Police to get involved, and the lad was promptly evicted and ended up homeless once more.
Homelessness isn't a simple problem, but indeed VERY complex.