> They don't choose to be on the streets, specifically. Instead, they make terrible choices that lead to being on the streets due to things like addiction and mental illness.

Except perhaps in the case of trauma-induced mental illness resulting from a trauma that is a forseeable consequence of a choice made prior to the existence of the illness (and even in that case it may be a problematic position), I am having trouble seeing even a remote argument that "being on the streets due to [...] mental illness" as the result of "terrible choices".