"But machine guns and WMDs aren't easily classified as defensive weapons."
SO how are "machine guns" comparable to nukes or WMDs? Thats always been a silly comparison.
"There are no absolute rights in the Constitution because the rights conflict with others when taken to the extreme. Somewhere that line is drawn, and people will always argue where it should be."
Sure, but the key point is that the power rests with the people and not the government.
Okay, give me a plausible scenario where you need a machine gun. When do you need to gun down a dozen people at once? A bad day at the office?