If Gritz is successful, people will get hurt. Gritz will probably be one of the people hurt, especially if he tries to make a "citizen's arrest" of a judge or other public official.
Which is probably why he's announced his intentions. The police will be waiting for him with cuffs ready, and will take him into custody so he can play the martyr for all the cameras which will doubtless be there.
The real danger, IMHO, is either A. Some lone, disaffected nutjob, fired up with all the rhetoric and wanting to "be somebody" like all such people, who pulls a gun and starts making mayhem; or B. Some wannabe "A-Team" types who try to pull a "rescue", and end up doing more harm than good as the police subdue them.