Isn't homelessness generally handled at the city and county levels? Both places can independently look at how different areas of the world have combated homelessness, and also share their successes (or failures) with each other without being forced to both do the same exact thing.
A friend's mother- a chronic drug user who lived off of welfare- moves from state to state as she uses up whatever benefits they offer.
Not all people are in that situation or abuse the system like that, of course, but small countries with tighter borders have a much easier time dealing with a less mobile population of homeless and indigent.
Personally think there's got to be parts of this though that would be applicable somewhere. Seems rash to be completely dismissive (and to be fair not much of that in these comments).