Not saying I disagree with the premise (support of gun ownership), but guns have 1 purpose. To fling a couple ounces of soft metal at incredible speeds, in order to kill something. That something may be an animal or a person, but that's the sole purpose of a gun.
Cars MAY be used as weapons, but that's pretty far down on the list of things they are designed for.
Shades of grey, and I'm not talking about soccer-mom porn.