See #33
See http://www.ca9.uscourts.gov/ca9/newopinions.nsf/11BBADA028A095D58825712D00016761/$file/0335701.pdf?openelement where those concerns are discussed.
The fact is that the government has to demonstrate the school had a reasonable and good faith belief that the students' actions would harm the good order of the school. On the basis of what else the school was allowing to go on that day, the court expressed extreme skepticism that the school's efforts were either reasonable or in good faith.