You have a vast misunderstanding or where to obtain firearms and also why Americans have the right to have them. America is a MASSIVE country and not all areas allow firearms. It’s based specifically on the area. As America is so large much of it is rural area with aggrieved animals. These tend to be the areas that allow open carry. A city like New York guns are effectively banned. The main reason why it’s in the USAs constitution is because is 2 fold. 1. No one should have to rely on anyone else to defend them. 2. It allows the government to fear the people. If they become too corrupt the people can’t fight against them. In fact, because it’s a constitutional right, the military couldn’t be activated against the people.