>"in a way that literally jeopardized the foundation of US democracy"
What does this even mean? This is way too vague and nebulous to ever get a grip on. I'm guessing you're talking about members of House/Senate contesting the results of the election, which they had a right to do, and followed the constitutional procedure for. You could also say this relied on democratically-elected representatives and wasn't undermining the rule of law.
>"and incited mass violence?"
Again, what qualifies as "mass violence"? I assume you're alluding to January 6th, which I hardly consider "mass violence" as it was very much localized and was over within a few hours. Surely the summer riots are more deserving of a term like "mass violence", no?
If we're talking about vigilante violence / decentralized intimidation, Maxine Waters told people to harass Trump staffers: "“They’re not going to be able to go to a restaurant, they’re not going to be able to stop at a gas station, they’re not going to be able to shop at a department store... The people are going to turn on them, they’re going to protest, they’re going to absolutely harass them.”"
As for your four bullet points, I am confident you can get the same kind of result (eroded faith in Democracy) by tweaking the questions to appeal to the sensibilities of people on the left. Just imagine flipping a few them by asking if a liberal agrees with "The rights of women and minorities are disappearing so fast that we may have to use force to save them" and "It is hard to trust the results of elections when so many people have been victims of voter suppression".