At a hearing of the House Judiciary Committee this week, the Republicans invited several leaders of the Oath Keepers to sit in the audience, including some who have not received pardons so still have convictions for sedition.
One of their leadership was present as a witness, answering questions from the committee members. When pressed by Democrat member Jared Moskowitz he explained why the riot happened;
Most of the people in the crowd were active or retired military personnel and law enforcement officers, who were marching peacefully but then the Capitol Police started using tear gas. This automatically triggered the training of these peaceful marchers who switched into self-defence mode and fought back against those that had attacked them.