Had the Capitol attackers set cars on fire and burned buildings and looted stores to express their frustration, you'd have a much closer equivalency. Setting fire to police cars and burning a police station certainly inhibit the officers directly affected in doing their jobs, but backup is available, and the entire system of policing was in no way in danger of collapsing. Taking down all the police in the country wasn't even the immediate goal of the summer rioters, as any rational person would tell you that their resources were not capable of achieving that goal.
But the attack on the Capitol was not like that: our democracy, as expressed in the most important election in the country, that for president, was in danger of collapsing, had Pence and others been captured or kidnapped or worse, and it was entirely within the resources of those inside the Capitol to achieve that goal. It was mere circumstance, luck, and the actions of the authorities inside the Capitol on Jan. 6 that they didn't.