Besides a lot of military and police support legal gun ownership as well and I highly doubt all of them would be choosing the totalitarian side if it came down to it so it's not entirely just civilians with pop guns vs a well-armed military.
I am certainly not an advocate of terrorism. But I think recent events show that it doesn't take a lot of arms for a motivated group to overcome a well armed unmotivated group. It makes me wonder what Hong Kong would be like now if 1 in 10 people owned a rifle or hand gun. Probably in the long run the situation would be much worse, but also maybe less hopeless.
The argument I reacted to was about terrorist tactic being used to create deterrent against tyranny. Like, it talked about killing children on their way to school.
Because answer to terrorism would be more freedom or something.
US?
The difference is more than just "the winners write the history books". The methodology was different. The patriots/rebels/insurgents weren't setting off truck bombs in city centers in the hope of making people not oppose them, and not just because they didn't have truck bombs. They weren't trying to assassinate the governor. It was fundamentally a war, not terrorism.
American Civil War 2 would be totally different.
If it would be that easy, ISIS would do it long time ago.