> The main exception was Jan 6, which we've been taught to believe is apparently worse than the civil war.

I’ve only seen that claim made in very narrow contexts (e.g., insurrectionists actually occupying the Capitol), in which it was central to the context of the comparison with the Civil War on the narrow dimension that it was universally understood that the Civil War was generally worse.

Also seen some “not since the Civil War” comparisons (e.g., billeting troops in the Capitol for its security), but those aren't even narrow-dimension “worse than” comparisons.