Mental illness is a terrible thing. His behavior bears nothing resembling rational or simply overly emotional.
I have seen it in my own extended family, and it is heartbreaking. Often meds can help; but most usually a patient decides he/she doesn't really need them and stops taking them.
The guy deserves sympathy and needs help. But there's only so much that the legal system, or a family, can do to force the situation. Maybe this time it will be different what with the gun threats. Society has gotten (properly) sensitive about such things.