So (God forbid) if you are confronted by a person with a gun, would you rather have a gun to defend yourself or just stand there and watch you and\or your family get shot?
Most people are quite happy with the idea of having a gun. For just the kind of reason you suggest.
It's the idea of OTHER PEOPLE HAVING GUNS that causes us concerns.
So . . . if we didn't have the 2nd amendment, what compromise would a wise society come up with? We'd still be a society that teethed on cowboys and Indians and graduated to a culture that probably has more cop/crook/war shows on TV than any other genre. So we aren't Sweden. But what would we do?
How can we make it easy for the good guys to have a gun and hard for the bad guys to have a gun?