it was an insurrection -- a violent uprising against an authority or government. I have no doubt there were a large number of angry, disillusioned people there with very bad intentions. They wanted to hurt and some even kill people, but mostly to violently vent their frustrations (I'm not justifying their frustrations, by the way).
To describe it as an attempt to overthrow the government is comical, though. Smashing glass, breaking down doors and using zip ties? That's the worst plan to overthrow a government in history by a landslide. But I'm sure the US military, the FBI and the entire law enforcement community would have just handed over the keys to the kingdom as soon as that Buffalo Dude smashed Pelosi's gavel down and proclaimed Trump the president.