In this case overthrowing is actual a protest that went out of control because of lax security. A real overthrow attempt would need to involve heavy weapons. Protesters didn't even have butter knives.
Only for some of the people involved. However, there were certainly people there attempting an actual overthrow[1]
[1] https://www.theguardian.com/us-news/2022/jan/14/oath-keepers...
There have been a few defendants who have successfully challenged the speed of the trial and courts have let them off. It’s far more likely that the DOJ attorneys are simply overwhelmed with the prosecution than they are purposefully persecuting the arrested.
> According to the George Washington Program on Extremism, the FBI has arrested 940 people in connection to January 6. Of those, 43 were convicted, 481 pleaded guilty, and 382 are still waiting for trial. Most of the people waiting are out on bail. [1]
It so happens that the defendants all committed crimes on the same day, causing a backlog. It also happens that DC is a strange jurisdiction that requires coordination between federal officers of different departments (Capitol Police, Parks Police, Secret Service, etc) in a town that must get all funding passed through Congress, which is functionally broken most of the year.
[1] https://newrepublic.com/article/170991/cpac-january-6-riot-p...