The coddling of Jew haters in our public schools has reached a new low. A Boston-area middle school principal sought to address growing antisemitism in the community by hosting a lesson on the Holocaust. But when Arab students were offended by the lesson about the historic Jewish genocide, he wrote a lengthy apology expressing contrition that they felt “left out or erased.” “The email message from William Diamond Middle School Principal Dr. Johnny Cole, of Lexington, Massachusetts, was sent to families following a presentation that connected Holocaust education to contemporary antisemitism — at a time when hatred of Jews has...