RNG-
As professionals we are (or should be) bound to our ethical practices (Social Workers, Psychologists, Mental Health Practitioners, etc.). There are (or should be) licensure reviews following formal complaints of unethical malpractice. It can be a "delicate" process regarding peer review. It can be like the foxes guarding the henhouse. I at times worked with "high risk" individuals; some of my clients' treatment plans and course of treatment were reviewed by the clueless "mucky mucks" in the Department of Mental Health/Boston. There was never a complaint issued.
Law enforcement is forced for the sake of public safety to deal with the community placed mentally ill at taxpayer expense usually.
The old State Hospital systems (nation wide) based on the Dorothea Dix model could offer a safe, utopian-like (with real meaningful jobs), and productive life for the inpatients. I guess the "costs" of decent, quality mental health care are nowadays too high . When I started working the "back wards" as an attendant the patients would by habit get up and line up long before breakfast and wait. Being curious I asked a couple of them why. They told me they were going to work at the dairy barn, piggery, factory, etc. I then spoke to one of them "You know the barns are closed now." And he replied-"I know.... I was just hoping." To protect the mentally ill from abuses we also took away their right to work and social identities.