This has been tolerated for years. Recall all the conservative speakers who have been shouted down by a handful of audience members? Those students should have been expelled within the week following a very quick and thorough hearing. It is too late. It is a little past 1938.
And it's a shame, because it set the stage for more virulent and violent protests against Jews and Conservatives. Same thing with destroying the history of the Confederacy, and the removal and destruction of any statue of a person who owned slaves. Those people who demand that the history of one group be destroyed to benefit another, are nothing more than the representatives of Hitler's fascist policies of the 30's and 40's.