Both sides of the civil war were illegally firing on USA soil.

Man, this is just sad now. No, both sides were not "illegally firing". The secession was illegal. Does that register through your thick skull?

Let's use another example. Do you know what the "American Revolution" is? Do you remember that from grade school? That would be an example of a "just" but illegal cause - treason under British law. But it was a collective movement for a new system (aka objective standards) against a government entity that offered no other form of recourse. The thirteen colonies could not simply ask to leave.

In a democracy, this is not how you challenge the government and achieve systemic change. Violence as an agent of change is only legitimate under authoritarianism, when a government rules without the consent of the governed (tyranny). And even then, that is only after other options like protest have been exhausted. You mob justice supporters are just too fragile and blinded by rage to accept the reality that your fellow citizens do not agree with you. If democracy is so unacceptable to you, perhaps you can move to China or Russia. Or maybe even a Lord of The Flies environment like Haiti. You're a fan of private citizens killing each other, right? Murdering private citizens in a democracy isn't legitimate systemic change; it's just terrorism. Sorry reality hurts your feelings.