Some dude’s AR-15 is not going to stop a tank.
You don’t use the AR-15 on the tank. You use it on the people involved in the logistics chain. If that tank doesn’t have a driver, mechanics, fuel, spare parts, etc then the tank is useless. Insurgencies in far away lands didn’t have this option but an insurgency at home certainly would.
The United States was founded with the help of private firearms and it’s citizens have always distrusted and disliked their own Government. What you’re talking about is literally baked into the fabric of our culture.
Meh, it’s all about where you are. I could wander around open carrying a firearm here in Wyoming and have little or no trouble. If I tried it in a liberal area of the country, for example Denver, I’d almost certainly have a problem.
It’s all about the culture of the area.