I haven't yet found a good metaphor for guns and their legality. Automobiles seem to be a favorite.

We could actually break this down into an equation:

Cars+Alcohol=Drunk Driving
Guns+Criminality=Gun Crimes

Which makes sense sense, although it fails on two major counts. One, alcohol is itself a product that is regulated, fairly heavily. "Criminality", or however else we want to measure what turns the controller of a gun into a criminal, is a more amorphous thing.

Secondly, while automobiles do have dangers, they also have a use that is different than the use of a gun. An automobile is used to get places. It can also kill people. A gun's primary use, however, is violence.

Thirdly...the words "sober people". Gun control would be more like making it harder for EVERYONE to own cars.

Again, I am not stupid enough to state an argument for gun control. All I am saying is that argument by metaphor and analogy is one of the weaker forms of argument.