Because Capitalists don't have a free reign at them and their social programs did not get completely pilfered by a bunch of rich sociopaths?

Here in US, HUD housing got defunded into the ground. Mental healthcare is run by drug dealers. All the housing is owned by a handful of cartels who also own all the companies as well as politicians who made all that legal. Yeah... it's pretty much a Banana Republic with nukes at this point.

Well if you want a serious answer, a) because why look internationally when you can first draw from internal solutions, not educated on what the article discusses (i went to the comments first), before trying to examine policy in a different culture on the other side of the planet, check and see maybe what your neighbor is doing first, and b) Europe, on a per captia basis, doesnt appear to be doing much better than Utah in terms of homelessness. A preliminary google search shows Utah has a homlessness rate of 9.8 per 10,000 people, and similar rates in Europe appear to be 22 (France), 23 (Netherlands), 41 (Germany), 11 (Denmark), 12 (Ireland), 33 (Sweden), 10 (Finland), etc. Doesn't look like, generally speaking Europe, has a better solved homelessness problem than Utah specifically. Doesn't answer why Florida which has a 13 per 10,000, but probably see point of neighbor being easier to work with than someone an ocean over. The outliers to this with exceptionally low homelessness numbers in Europe appear to be (again, just on preliminary seaching),Spain (5), Latvia (3), and Croatia (1). Not saying this to nessicarily defend Utah or to shit on Europe, but something to consider.

What do you mean by "successful European countries" The data I found shows that the Europe and the US are on par. What would be a preferred system?