I don't care about their wishes, guided by drug addiction and mental health issues. To allow and enable this much squandering of human potential is a moral crime.
Get people clean of drugs, healthy, stable, and educated. By force, if needed. If from that baseline he decides to go back into a life of drugs and onto the streets, then so be it. But don't allow people to commit themselves to a slow death until they've been forced to step onto a better path and see what their life _could_ be.