This is easy. If it's sole purpose is to kill another human, it shouldn't exist. I know the NRA would have you believe that the best defense against a bad guy with a gun is a good guy with a gun, but a better solution is no one with a gun. I think there is some truth to the saying "guns don't kill people, people kill people". But until we can fix everyone and rid the world of bad people, we shouldn't be supplying them with the means to kill with automatic assault rifles.
AND SO IT SHALL BE WRITTEN!