N The concept of keeping mentally ill individuals away from anything that can injure or kill themselves or others is a sound idea.
I don't think it is. I think it's a unicorn fantasy. That girl in Stillwater who plowed her car into the parade; everybody immediately started talking about her mental state. No one asked how she got the car, what kind of car was it, etc.
How would you keep someone away from blunt objects, the favorite tool of killers everywhere?
There will always be ways the homicidally inclined can do the deed.