If the American government wanted to exterminate millions of people, they could do it without having to take our guns away. Having over a million ground troops engage in one-on-one hand-to-hand combat with civilians would be too risky and take too long. America's military would not need to waste time rounding up the people they wanted to exterminate and building facilities to house them. They could do it right on the spot using machine guns or missiles fired from attack helicopters, or missiles fired from fighter jets, or bombs dropped from bombers, or artillery shells fired from battleships, or even lasers.