Literally people born with or contracting disabilities that leave them permanently destitute due to you not being able to eat or house yourself without work you can't do because your disabled.
I hate how when there is any picture of Soviet blocks it's always shot in autumn or winter when it's overcast. I live in an ex Soviet country and when these bad boys are maintained they can outperform new apartments, be it in functionality, amenities or price.
The point of hostile architecture isn't to solve homelessness, just to send them to the next block/town over (not saying you don't understand that, just pointing it out).
I wonder if hostile architecture also kills people. Increasing exposure to cold and reducing opportunities to rest doesn't seem good for your chances for survival. I guess that would solve homelessness, but in the worst most morbid way possible.
You're absolutely right in your suspicion. Like so many "let's punish the poor and vulnerable so they'll stop being poor and vulnerable" policies that people think are just a "righteous" inconvenience, hostile architecture DOES kill people.