FWIW, the protestors at the capitol didn't kill anyone.
0. https://www.politifact.com/article/2021/apr/20/update-capito...
Also, don't call them "protestors". The nicest term I can think of for them would be rebels since they were in open rebellion to the United States. Some people at the capital that day were protestors, but the people who stormed the capital went far beyond protest.
> These include people arrested outside the Capitol grounds with weapons like guns and Molotov cocktails
https://www.nytimes.com/interactive/2021/02/04/us/capitol-ar...
Also, there are charges pending against people who had a stash of firearms in a hotel in Virginia, just across the Potomac, and planned to bring them over at a later stage. Firearms are largely banned in DC so the idea was to take over the Congress first and then establish a defensive perimeter.
Now, I didn't say it was a good plan.
1. Coups don't have to be violent.
2. The hypothetical coupers would not have believed it to be a coup, merely reinstating the rightful president.
3. Those invading the capitol were likely mostly just doing because they could rather than because they had a concrete plan on what they'd do if they found Pence and the representatives. I expect the vast vast majority would have done nothing more than shout slogans.
4. In general, when it comes to ones Outgroups there's a strong tendency to assume the worst at every opportunity. You might want to work to counteract that tendency (if only so you can better understand said Outgroup).
This reads at a similar level of credebility. Compate the footage from the capitol with footage of Ukrain protests back in the day.
You cannot know this. You should be suspicious of thoughts that say your Outgroup is worse than what you have concrete evidence for. Confirmation bias is a hell of a thing.