Finland has 5.5M people and about 5 thousand homeless. Los Angeles county has 10.5M people and estimates are nearing 100,000 homeless. The situation is an order of magnitude different in Los Angeles, even by West Coast standards, and what works in Findland is unlikely to scale anywhere else, much less a place like the U.S. which has the bare minimum of a social safety net compared to the rest of the developed world.
That kind of defeatist attitude won’t help either. You can’t create a systemic problem like this and then just shrug and say “it’s gotten too big we can’t stop it now”.