If the 1/6 insurrection was just a riot then the civil war was a just riot as well. Civil unrest is usually a general breakdown of local order and has happened many times in American history for a variety of reasons. Attacks on the leadership of the federal government have been very rare in comparison.
I'll put your vote with Dragonlady's:
Righties: Jan 6, but Dragonlady and
occupied say to pull this one off.
Lefties: Never ending Portland, Minneapolis, Occupy Wall Street, BLM Ferguson, and Berkeley, Baltimore, Kenosha, DC, 2016 Trump inauguration riot.