You seem to be assuming that people pushing "keeping weapons out of the hands of the mentally ill" want to keep it from being abused. I don't think this is a very safe assumption.
In any case, I don't think keeping a weapon out of the hands of some little old lady who made the mistake of telling her parents she was a lesbian as a teenager and then spent years locked up in a mental hospital being tortured as a result is in any way a desirable goal.
Someone (I forget who) one wrote that anyone who can't be trusted with a gun can't be trusted outside a cage. I've found that the victim disarmament crowd actually agree with that--they just want to turn the whole world into a cage.
In any case, I don't think keeping a weapon out of the hands of some little old lady who made the mistake of telling her parents she was a lesbian as a teenager and then spent years locked up in a mental hospital being tortured as a result is in any way a desirable goal.
Someone (I forget who) one wrote that anyone who can't be trusted with a gun can't be trusted outside a cage. I've found that the victim disarmament crowd actually agree with that--they just want to turn the whole world into a cage.