Or more specifically, Federalist #29, which argued that the US should not have a standing military. THAT was the reasoning behind 2A. Of course our forebears learned pretty quickly that was a dumb ass hill to die on, and we have a huge standing military. The reasons for the 2A have been buried in progress, yet scared neanderthals still feel the need to cower with their guns in fear that the big bad world will touch them.