[Destroyer]

it means nothing because we have a regulated militia called the armed forces
and if a time comes when they fail to stop an invading force, all of the armed citizens will mean nothing, because as armed as they could be, they wont have tanks, or jets, or nuclear missiles. But the other people will. Thats why it means nothing today to claim the right to bear arms has anything to do with the need to form an active militia from citizens.