You lose the right to call a protest 'mostly peaceful' when more than 135 people have been arrested and indicted, and five people died from the event. The moment people began breaking into and besieging the Capitol, it was not longer a protest. You're grossly mischaracterizing what happened.
By this logic, virtually all public demonstrations (even the ones that turn violent/riotous) are "mostly peaceful" because typically only a small minority of people actually take part in violence and looting in comparison to the greater whole. If you're willing to stand by that assertion as well, then I guess that's fine. Still wrong, but then at least you're being equitable.