Typical dumbass idea. Identify a deranged psycho with a gun. Raid his house and take his guns. Enrage him, let him watch as his dad’s guns are banged around and taken away. Let him know that coworkers or family has turned on him. isolate him more.
Leave with the guns. Leave this there alone... bitter and more angry that before.
Leave him with gasoline, explosives, knives, hatchets, chainsaws, machetes, axes, rental trucks, cars, poisons, electricity, matches, etc.
If it were me, I think I would lock up the psycho. And this is already fully possible if they are truly a danger and you can demonstrate it.
I remember reading of a man who’s home was raided and his MINT CONDITION unfired Thompson sub-machine gun, legally licensed and registered confiscated.
It took him several years of lawsuits to get his Thompson back, and when it was returned to him it was a rusted up wreck.