The point of the state is to maintain one class's domination over others, violence is just the means to achieving that. It's not a good thing.

And not all armed resistance takes the form of open warfare.

Under a strong state one viable way of resisting the state is community defense. For instance the Black Panthers began open carrying to observe police doing traffic stops, because black men kept getting killed (edit: of course we know they still are).

The state's response was weapons bans. That ban targetted the Black Panthers and was selectively enforced against them. This is where California got its reputation for banning guns. It was the state maintaining its ability to oppress people along class and racial lines.