And also the founders. Some of them loved the idea of a militia instead of a standing army. There was even an attempt at a militia navy. Which is insane. “Got my musket and rowboat. Off to defend the homeland!” rows towards French 90-gun ship.
The whole idea behind a militia was barely practical back then, and isn’t at all with industrialized warfare. If that’s the argument for the 2nd A, then it might as well be tossed on the same pile as the 3rd A of “anachronistic stuff that made sense to somebody at the time”.