Uh-oh, looks like Richard and I are going to agree to disagree.
Though I DO agree: if your gun is used in a crime you should be held responsible unless you've reported it missing. If your car is, you are.
And I agree that parents should be held responsible for their children's crimes with the parents' gun. (Again, just as with a car...)
I still don't think automatic weapons should be sold, the cost outweighs the benefit to society in my opinion.