I agree comparing guns to cars is a poor analogy, and that it does matter what they were designed to do. This is why there is never any "assault car ban" on cars (especially like sports cars), they are not designed to kill.
I would not put it past the gun control community to introduce laws charging liability to gun owners if their stolen guns are used in crimes. Lets face it, there is a problem with criminals gaining access to guns... there is a responsibility to make an effort to keep our guns safe from theft or our rights will continue to be whittled away with every future incident hows that for liability?
lightweight, cheap, strong... pick 2