It's perfectly clear that citizens were allowed arms to create a militia to defend the state, not overthrow it.
The notion that our own govt is or will become sufficiently repressive to spark a popular revolution is pure paranoid fantasy, anyway.
For one, they weren't 'allowed' arms. For two, interpretation that the 2a is dependent on membership in the state militia is terrible English. For three, the government's just powers are dependent on the consent of the governed.
Pure paranoid fantasy indulged in by well educated gentlemen who had just done that very thing. The intention was that agents of government would live happily in a box of legitimacy, protecting the liberties of its citizens instead of dreaming up new and interesting ways of disarming them.
"Those who make peaceful revolution impossible will make violent revolution inevitable." - some ignorant knuckle dragging far right wing radical militia leader bent on the overthrow of our enlightened government.