Except the part where there was NO militia when the amendment was conceived, written and passed. Everyone, (well every male), was “the militia”. Formal or not. And if you actually look closely at the military organization of the US, you would see that it’s still the same today. There are layers to the US army. And it goes down to you as you walk around on the street.
Historically, yes they are. They are the ones with nothing left to lose except their lives. And are more likely to revolt. Anyone with a couch and xbox isn’t nearly the threat to those in power. I believe that’s called ‘Bread and Circuses’