Of course this is all theorizing. I don't America is in danger of that sort of civil war just yet.
Government isn't going to attack lots of individuals via tanks/artillery/etc scattered thru innumerable suburban neighborhoods.
Every year >20,000,000 US individuals partake in live-fire live-target drills, acting practically as lone wolves, as well- and self-equipped snipers in Operation "Deer Season". Just 0.001% of those, sufficiently motivated, would paralyze an oppressive government.
Yes, most "plinking" aren't practicing for serious combat. But they are practicing, and even with a high attrition rate they would, as a diffuse group, take down and/or demoralize violent oppressors. And that's not counting the small but far-from-trivial number taking CQB training seriously.
This year's legislative freak-out over thousands of unarmed & mostly-peaceful protesters occupying the Capitol wasn't so much what they did, but that they represented an enormous number who are well armed.
Ok that said, I don't understand how guns protect us from the government. I think the biggest threats area slow and mundane. Ie erosion of rights or increasing power of some portion of the government over decades. There's no one cataclysmic event that overnight would make sane people take up arms and start popping off.
Likewise, let's say the government went all evil-like. Like in a movie. And you somehow got a huge citizen resistance trying to fight the government forces, unlike in real life where apparently the country would be split and half would join the government forces. The government has armor, air support, artillery, surveillance, and logistics. This isn't the 1700s. Just access to small arms is meaningless unless the 2nd amendment is broadened to include all weapons. And even then, machine guns, manpads, tanks and heat are just tools and a tiny, inconsequential part of warfare.
You always see gun people plinking away at stationary targets. Arguing about mlok vs picatinny. Maybe practicing their tacticool speed reloads. You rarely see people practicing force on force cqb, urban fighting, how to fight as a team.