The January 6th insurrectionists didn't attack "government buildings", they attacked the elected government officials as they tried to certify the election.
An "assault on a building", isn't an insurrection, even if it's a court house, because it's not the seat of government, nor can you overthrow the US government if you kill a judge. The January 6th coup attempt was an assault on the members of the House and Senate, in an effort to prevent the election of Joe Biden.
This is NOTHING comparable to it in the history of the nation.