"Why do you need an AR15?"

[stanc]

A bunch of quotes saying that citizens should be able to have guns for self defense, and to be able to overthrow the government.

And yet, the Second Amendment does not cite either as reason for the right to keep and bear arms.
Not only that, the Constitution says that the militia can be called upon to put down armed rebellion.

The 2nd Amend is about preserving a big stick for the citizens, so the security of a free state remains a free state. With out a big stick all citizens have are opinions. Not much use against a state that has both.

Citizens do not have big sticks. An AR15 is a teeny, tiny little twig compared to the Apache attack helicopters, Abrams main battle tanks, F-16 fighter bombers, etc, etc, that the government has.