The automobile analogy works. Not that you need an analogy to justify a constitutional right, though.
Guns and cars are both standard means to an end. Both have inherent corresponding risks. The big one being death. Clearly cars, are the main choice for americans who want to go from point A to B. Statistics back that up. There are a hell of a lot of guns in this country, I don't think we need stats for that. If you want to take a leap of faith and claim that most people don't consider firearms the standard for stopping a two legged threat in a life or death situation, then rock on, but you'll just come off as an argumentative wise and beautiful woman. ( Not you specifically, I don't like to put words in peoples mouth.)