The point is, mentally ill or not, intrinsically evil or not, there are some people who do very bad things, and individuals, communities, societies, are right to take whatever steps they can to protect themselves from these types. To do that, whenever it's possible, it's only just that a given community be warned that such a person is on the loose near them. They don't have to be warned by name, necessarily. But it's not asking too much for the police to be able to warn a neighborhood "There is a 6'2, 170 lb., black male, considered violent, escapee from XYZ institution, possibly in your neighborhood. Lock your doors, be alert to your surroundings, etc., etc."
Our Homeowners' Association puts out e-mails more or less to that effect all the time. There are some guys who occasionally take a van around the neighborhood, claiming to be "tree cutters" but who are believed to be casing homes for possible burglaries, as one example. We had a rash of things being stolen from unlocked cars parked outside; we got several e-mails from the police warning us about that and asking us to be on the lookout for anyone seen going into cars.
Last year there was a case of a man seen approaching two school-girls and asking them questions that made them uncomfortable; the girls ran. This was reported within half an hour after it happened, and the guy was picked up.
All of that is well within bounds for neighborhood protection. I don't see why this case should be any different. People deserve to know what's going on near them.