I was thinking of the UC berkly violence but I guess something similar happend in Davis https://www.google.com/amp/s/amp.cnn.com/cnn/2017/01/14/us/milo-yiannopoulos-uc-davis-speech-canceled/index.html?client=safari https://www.google.com/amp/s/amp.cnn.com/cnn/2017/02/01/us/milo-yiannopoulos-berkeley/index.html?client=safari In both cases protesters use violence to shut down speech. If we accept that as normal and acceptable without punishment of the violent individuals it sets a horrible precedent. Today it might be some alt right wignut in Berkeley but tomorrow it might be a BLM speaker, Muslim speaker or an abortion clinic in Alabama. The point is protecion of speech should be grey and only in cases of clear and immediate danger should it be allowed to be suppress.