Have not logged on there in some time. Got tired of the nonsense.
My answer? None of the above. In fact, simply mind your own business, people.
There is no rational restriction, law or "mental health" program that would prevent those who want to harm others from doing so.
I am a mental health professional... I also carry a gun. I teach armed self defense. Smelling salts available.
Anyone who actually wants to harm innocent people is certifiably "mentally ill." That can very seldom be determined before the person actually attempts such harm, however. When it is attempted, the person needs to be completely restrained from harming others by judicious self defense. The possible, might, maybe and panty wadded fear of some people without actual harm is not enough reason to do so. None of that can be effectively or rationally controlled by government or any "laws."
There are many, if not most who are called "mentally ill, who have considerable trouble with their mental, emotional and physical health," but have zero desire to harm innocents. Laws restricting them from owning the tools to defend themselves merely create a large body of helpless victims for those who do want to commit murder, etc.
There are very few effective, ethical ways to prevent suicide. Trying to restrict the possession of guns by "law" is pretty obviously pointless. If you want to die, why would you care about any law? Why would not having a gun stop you from using any other method you could find to end your pain?