I think those that are responsible enough would do so and there would be no problems.

I think those that are not responsible enough probably have other priorities, like spending their money partying, rather than on firearms.

I also think many criminals carry concealed anyways.

I also think many people are not responsible enough to vote or drive a car.

ETA: just because quite a few might fall under the category does not mean the rights of those who do not should be infringed.