The thing about every Tom/Dick/Harry owning the type of guns that are only good for shooting people is that PEOPLE DIE, and when they die their guns get handed down, usually to family members, and some of those family members might not be very smart.
A single gun can last much longer than one or even two, three, four generations.
YOU might be a very good and responsible gun owner, but your son/brother/nephew is probably a douchebag, but you died and now HE has the guns. Let's hope he pawns them for a bag of weed or for some stereo components.