Assuming the drills are necessary currently, doing "the one thing" isn't going to end them for at least decades. It's not going to be an either or situation.

The best solution I see is worldwide disarmament in some manner that still allows equalization of women, elderly, etc in physical force. That's a pretty tall order honestly not sure that happens anytime in my lifetime. It also has a sort of 'prisoner dilemma' element where the individual would be insane to give up their arms while the criminal still has theirs.