You can't tell your students to join you in a riot (here, the WTO "Battle for Seattle" in 1999) by telling them that it will enable them to network with you and your friends during the festivities and that what they see during the fun might be on the final exam. And if you do, and the University fires you, you won't win your lawsuit.
Sure, Judge McKeown's opinion in this case is a little bit more complicated than this. 'Cause I've boiled 20 pages of commentary and facts into two sentences. But that's basically what she holds. And she's right.