Problem with that logic man
Criminals are criminals, they dont care about the laws, they're ALWAYS going to have guns
If they KNOW guns are banned, the average law-abiding suburbian household ISNT going to have a gun laying around, that makes them PRIME targets to break into, criminals know they know they aren't going to get shot.
If EVERY criminal KNEW that every household had a gun, you think they'll think twice about breaking in?