One of the issues is that our broken policies are helping to fuel high rates of homelessness. Once you are homeless, you now have a lot of logistical barriers to accomplishing anything, plus social stigma piled on top of that and other issues (like hygiene issues that tend to make health issues worse and harder to resolve in most cases).
There is all kinds of data showing it is cheaper literally give people housing than to let them be homeless. I'm not even asking the US to outright give poor folks housing. Just make it possible to find housing that doesn't cost an arm and a leg and where you can make your life work without a car.
I don't think I'm asking all that much, to be honest. This shouldn't be that hard. It's not like we need to invent these concepts from scratch. There are lots of examples to draw from for how to make such policies (plus healthcare) work better than what we've got.