Not quite. Vehicles, if stolen, aren't inherently going to be used for violent or even nefarious purposes. A stolen gun has one purpose, to be used in a violent gun crime. Maybe not by the immediate individual who stole it, but the end point of a stolen gun is almost always going to be gun violence.
Therefore owning a weapon is, and should be, a greater responsibility. Why should it not be treated as such? If you want the right, own the responsibility as well.
I'm not saying you need to serve life in prison because your gun was stolen, but if you had it just laying around and didnt want to report it stolen, and it was used in a crime, you do bear some responsibility for that.
Look we hold parents responsible if they allow alcohol at a teenage party and they drive drunk. Bars have been held legally liable for over serving patrons who drive drunk. How about instead of buying your third $700 rifle. You buy a gun safe instead and make the world a little safer? (Not you specifically, I'm sure you personally are very responsible).