> A large minority of the civilian population would have a much easier time deposing the government and instituting a new one than a foreign state (or group of US states attempting to secede) would. [...] A large minority of the population rising up against the government would likely gain the support of some of the military and could blend in with the rest of the population when not fighting.

I think this is pretty rosy-colored view of what would happen. A "large minority" would have to be several hundred thousand people, perhaps a few million. Anything less is just a radical cult that will promptly be put down...and everyone will say "thank goodness" as they watch on the evening news. If something big enough happens that a few million people take up arms, you have a full blown civil war and things are totally different.

Stockpiling guns and weapons is the opiate of libertarians - "it's fine, I have the weaponry I need to overthrow the government if things get bad enough". In reality, you have a better chance fighting zombies than successfully overthrowing the government through violent means.

To be clear, I have nothing against guns. I'll probably purchase one once I've moved into a more rural area. But I'm under no illusion that the weapon will ever be useful in deposing any government.