Let's simplify this problem.
On the one hand, we have Mr. Law abiding American.
On the other, a dirtbag who steals, and or kills to feed a drug habit.

Mr. Law abiding man will not own a gun because it is against a local ordinance. Mr. Dirtbag couldn't care less about local laws, and will own a gun to give him an edge.
Does that make sense? All it does is make Mr. Law abiding American vulnerable because the dirtbag knows most people are not armed.
When Florida passed its right to carry law, the crime rate nosedived.What does that tell you?