The 2nd amendment does not give the citizenry the ability to overthrow the government, it prevents the government from restricting the right to bear arms because bearing arms is necessary for a free state.
The people, in a Democracy, are the arbiters of power and the government serves the people. If the government does not serve the people, the people have an a priori right to reform that government.
The people, in a Democracy, are the arbiters of power and the government serves the people. If the government does not serve the people, the people have an a priori right to reform that government.