Comparing owning a dangerous breed like a Pit Bull to owning a firearm is beyond ridiculous. Makes a comparison that isn't even close to valid as those are two entirely different things. One, an inanimate object without a will or ability to act own it's own, the other a living creature capable of taking action without, or in direct defiance of human command.
I have never heard of a firearm running loose, jumping a fence, attacking people, including small children by itself, of it's own accord. Way too many accounts of dangerous dogs doing just that, leaving containment, yards, breaking ropes and chains, attacking without provocation.
To compare the two, to attempt to justify owning a dangerous breed just because guns are dangerous when handled or used by idiots, well, as an argument it just fails. How about comparing owning a Pit Bull to owning a car, cars kill too you know. Maybe we should be able to keep grizzly bears in our backyards? Why not, hey, what right does the gov't have to say we can't? Or lions? How about keeping coral snakes in your yard? We have rights, right?

I would go along with this, you can keep a dangerous breed of dog, but if it ever attacks someone, you go to prison for life, no possibility of parole. Why not, surely owners of dangerous breeds should do everything in their power to make sure it never hurts anyone. This would guarantee their vigilance. Works for me, but of course I don't need to own a Pit Bull. I don't care if anyone thinks I am a bad-ass or not, and don't need a dog to try to prove something like that.