Perhaps the people who were looting commercial districts would have looted the Capitol if they were put in the same situation. Perhaps the people who looted the Capitol would have looted storefronts if they had been mad at what they represented. There's one way to look at it where you have a generalized trait of not caring about following the law when you're surrounded by a large group, a trait that some people have, and that can be activated whenever the right circumstances arise.