You can show the bodily autonomy argument is nonsense with a simple thought experiment. What if it were someone you actually cared about? Your son or daughter, sibling, loved one? Would you say "oh well, I guess I have to respect their bodily autonomy". No, you'd drag them into rehab whether they wanted to go or not. Because you know that is ultimately better for them. That's what you do when you care about someone. You don't let them rot and die on the street. Clearly the folks pushing for letting people die on the street do not care about the well-being of those people.