A) Your being anachronistic and illogical. The vote to object didn't cause the riot, that's not the order of events. And people disrupting the opportunity to object are in conflict with those trying to object. Jim Jordan had no opportunity to reasonably object to the election on January 6th because the rioters made are debate moot. The only way that logic lands is by lumping together everyone who disliked or doubted the results of the election, but in that case...When setting up a commission its kinda important not to let the guilty judge themselves. People who voted to object to Biden's election win have no place on such a commission because they are responsible for causing the whole mess.
B) You could stand to lay some of the blame on the party that spent 4 years declaring the previous election invalid and encouraging riots in major cities, who supported pounding on the doors to the Supreme Court in opposition to a judicial appointment or setting buildings on fire outside the White House.
If you don't want the guilty to judge themselves, you can't have this commission at all.