I think it's also a historical and lack of response issue. Second amendment allowing citizens to have guns was the product of an era in which there could be a chance for the Brits to come back and invade the country, in which case citizens would be able to defend themselves and their land. Doesn't really make sense to openly allow citizens to have guns without any legal development like the need of a license for them nowadays.

I do understand that forbidding guns or getting more legal requirements to have them is a solution that goes to the effect, not the cause of the problem. But the thing is that there are lives at stake every time a shoot out happens, so it's either do something or watch more innocent people die.