A protester holds a placard in support of Palestine at the University of Washington, Oct. 13. Photo: Chin Hei Leung/Zuma Press If you thought claims of anti-Semitism on university campuses were exaggerated, you can’t think it after the past week. The spectacle was appalling: university presidents responding to the murder of hundreds of Jews by pretending that the fault lies partially with Israel and that reasonable people can differ over whether Hamas’s atrocities are justified; student groups issuing letters proclaiming solidarity with Hamas; campus protesters brandishing signs bearing such slogans as “resistance is justified” and “from the river to the...