“Even if Northwestern can define harmful speech, enforcement will likely be uneven. Last spring, Northwestern failed to punish student conduct that obviously violated its conduct code. Moving forward, will Northwestern really punish student protesters chanting, ‘From the river to the sea, Palestine will be free’? What about students who post the phrase on social media? We suspect the university will find itself unable to enforce disciplinary action in the face of concerted student protest. But students with minority views, those unable to rally protests, those whom administrators find unsympathetic, will not be similarly protected.”