The reason our system works is that citizens and politicians abide by elections. The one significant instance when they did not resulted in a civil war, not a tyrannical government that disregarded electoral outcomes. Our constitutional form of government has NEVER required and "armed militia" to keep it in check. Indeed, virtually all examples of an "armed militia" being formed in this country have been vigilante mobs who murdered fellow citizens. The one exception was the Whiskey Rebellion when George Washington and Alexander Hamilton raised a militia force to confront rebellious citizens.
To argue that the federal government has ever been "afraid" of self appointed militias is simply stupid. The constitution calls for the "armed militia" that the second amendment protects to be headed by POTUS. Does that make any sense to you at all if the armed militia is to control the government. More like the armed militia is there to control any standing military from taking over the government, which after all was exactly what the framers of the constitution were concerned about. Our nation's professional military have never attempted a coup and that tradition is deeply ingrained in our officer corps. However, assuming the military ever did drive tanks into DC and take over the reigns of power, do you seriously think a disorganized group of NRA fanatics is going to stop them? This ain't 1776 bubba. M1A1 verses a pickup truck anyone? 155mm howitzer verses an AR15?? Predator drones versus some helicopter drone kit you bought from Amazon?? The "armed militia" fantasy is simply a marketing ploy by hardened gun nuts to attempt to use the constitution to buttress their case. It has only been in the past 20 years or so that a conservative SCOTUS has given any credence at all to the notion that "armed militia" was anything but a vestigial and outdated concept aimed at the King of England. There is no noble history of armed militia in this country, just a vapid argument used by gun nuts.
Again, I have zero issues with guns for sport or even self protection in one's home. I don't like the idea that anyone who is paranoid can go get himself a semiautomatic weapon and stick it in his pocket to make a trip to Costco or the supermarket. And, I think anyone who shows up at McDonalds or Starbucks with an AR15 has just met criteria for having all weapons permits cancelled and guns removed by the local police chief.