It's all subjective, both sides can argue they felt it was justified. Multiple friends and family had their businesses vandalized and destroyed. One in particular had over a million in damage between his two restaurants. He had to close them down and insurance denied because riots are not covered. I'm sure he would disagree that he was responsible for oppression and deserved to have his livelyhood, the livelyhood of his multiple employees, and his family destroyed because they saw things in one perspective.
By your same accord you can't condemn the protest at the capital on the 6th, you have to condemn those that were idiots and caused damage like bad actors. Both groups felt they were in the right, both groups felt marginalized. You can't dictate how someone feels on either side. So you have to either condemn equally for the outcomes, or not. In this case people chose to condemn one and not the other.
You're not going to convince me that battling "systemic racism" isn't the same as battling "a system designed to limit and inhibit your way of life because you're a republican or trump supporter"
Take the recent incident in boulder, people were all to quick to blame it on a White Male Gun owner, and demand people have their guns taken away because these things happen. As a white male gun owner, wouldn't it be fair for you to feel constantly attacked and oppressed? It' doesn't matter if you think it's the same or not, oppression is oppression. When conservative news is shut down, when far leftist ideals are pushed and nuanced discussions shut down, it's easy to see where those that stormed the capital have a grievance. In the case of the boulder incident, it turns out the attacker has extremist views, bought the gun legally (because of failures in the process of vetting by the FBI) was already under investigation by the FBI, and ultimately had been planning an attack (to include a trump rally prior to covid). Yet the news paints this as a reason why Trump supporters or Gun enthusiasts are bad.
Parler was an alternative site, you don't have to agree with it, but the fact is nothing posted there wasn't present on all the other major platforms, often times being much more represented on them. It was singled out and chastised because it was a "trump" supporter platform.
Until you and by you I mean people who hold the stance you presented, accept and acknowledge the hypocrisy and ignorance of the one sided arguments, you're going to continue to create the thing you're so desperate to prevent. Angry, people that will turn to extremes because they're constantly being derided and chastised for their views and way of life.
Capital protest was fine, Rioters breaking in was abhorrent. BLM protests were fine, Rioting, looting, and destruction was abhorrent. The two aren't different. The context of how the protest started is irrelevant. Parler, Facebook, Twitter, and whatever other platforms you use are no different. They are fine, calls to violence or illegal activities are abhorrent.