Well, it was the Police who opened fire on the crowd, and a few instigators who have not been charged with much who urged people on.
That said, I'd bet there were lots of three letter agencies in on getting the ball rolling, acting as 'tour guides', doing planning and guidance, and otherwise inciting trouble.
The worse that the incident could be made out to be, the more prestige in hunting down participants, and look who is getting a new campus as a reward...
