99 percent invisible did a podcast series on the reality and nuance of homelessness. It is the best take I’ve seen and really opened my eyes on a number of things. Episode 3 covers housing first, but I would recommend going through the whole thing.
Housing first is evidence based too. And cheaper than emergency services. And when done right much more dignified.
Yet here we have this society full of punitive know it all skeptics who don't actually seem care about the evidence quite as much as they care about dominating social structures that help them feel better about their insecurities.
In a lot of cases they wouldn't have become mentally ill or a fentanyl addict if they weren't homeless. Yes, addiction drives tons of people into homelessness, but homelessness can also cause addiction since a homeless life kinda sucks.