There are no cures for the most serious, chronic psychotic mental illnesses. Such patients can be helped in many ways but can never be normal, and many such patients, for a variety of reasons, do not cooperate with help that is offered.
Very few of these people are violent, and many of them just prefer to be left alone to live in their strange worlds.
How does one "help" such patients when they have no desire for help and treatment but are unable to live in the real world? Asylums existed for a reason.
E. Fuller Torrey discusses the challenges of "benign paternalism" in the care of the seriously ill: A Prescription for Mental-Health Policy
It is a thoughtful essay, but I will object to the term "policy" because it implies government action in a situation in which nobody knows what is best to do. "Help" has to be individualized, not manualized.