I always use the swimming pool and sport's car argument when talking about this stuff, too. Do you have to take a class to own a swimming pool? Are your rights to drive or own a swimming pool protected under the Bill of Rights?

I get weird looks from people all the time when they see the shotgun sitting next to my desk in my office. When they ask me if I'm worried about it killing someone I just tell them that it's never gotten up on it's own and gone off to my knowledge. Honestly I'd trust a CCL holder or someone who owns NFA weapons a lot more than I'd trust any other random stranger on the street. Those people tend to value their rights and the rights of others.