I have no idea. But I do know that it was enacted to keep our gov. from taking over from the people. those that can't protect themselves from madmen like trump are in trouble.
Also thinking back to the time a militia was important for the safety of the state from rebellion, invaders of foreign nations, as well as for attacks from native tribes. The communication methods, travel times for a military to show up would mean that the attack would have already been over well before they got there.