There's some debate over whether or not Utah really did solve their homeless problem:

https://www.huffingtonpost.com/kevin-corinth/think-utah-solv...

https://www.theguardian.com/us-news/2016/apr/27/utah-homeles...

And even when a region does offer good homeless services, word gets out and more homeless move in:

https://www.heraldextra.com/news/local/more-homeless-move-to...