"Well if you were upset about the riot at the capitol but you weren't upset about the riots last summer then..."
That is not how you address wrong behavior. That is how you PROTECT wrong behavior. That is how YOU protect YOUR ego.
Last summer during the protests there was some objectively bad behavior. When protestors went into restaurants and intimidated people into pledging support for the cause... that was wrong. It was horrid. And I said so.
I didn't try to soften the blow by bringing up some horrible thing done by right-wingers. I didn't try to argue that those were just plants to make the cause look bad. They were liberals... and they went too far... and they were wrong.
Presently, there are a lot of folks on the Right who are having trouble with making such a statement. Even if they recognize that what happened at the capitol was wrong, their ego can't help but cushion that recognition with a blanket of whataboutism. "Yeah, the protestors in Washington shouldn't have done that... BUT Y'Know, THE DEMOCRATS DID THIS...."
Let me give some honest advice here to some folks. Just be wrong. Let the behavior be wrong. No qualifications. No side issues. It is good for your soul to not muddy the waters, to not make excuses, and not deflect.
You know this particularly if you are a parent or work with kids. When they admit wrong with qualifiers... they aren't really admitting anything. They are still protecting the bad behavior. But when the light goes on and they see their error, you know good change is on its way.