Well, cars are as dangerous as anything else when handled badly or intentionally used as weapons, but they also have a good, fundamental purpose.
I don't really see that guns can be sheltered under that umbrella; after all, their sole design purpose is to kill. There is no other legitimate function for them, unless as threat in a defensive sense, which is but one step removed from killing or at least seriously injuring in a defensive move. In short, they serve only to cause damage, either terminal or serious enough to incapacitate.
All of which seems to me to indicate that their use outwith home protection or policing should be banned. Period.
Hunting is a whole other topic, of course, and even there, that folks can drive around with rifles on racks in their vehicles, whether they are really about to go out and catch something for dinner or not, strikes me as bizarre. Just imagine: some guys stop for a beer or three, get into an argument or just feel macho, go out to the vehicle and take one of those killing machines down off the rack... How do you reason with any guy with a head of beer, his manhood under imaginary threat, and a huge gun in his hands? And all in front of his equally nutty peers? His mother later telling the local press that her son is really a good boy won't help you and your widow one goddam bit, will it?