About a month ago, as JD Vance was fresh off a trip to Israel, a young man at the University of Mississippi asked him why the US still supported the Jewish state. Wearing a Make America Great Again hat, the man accused Israel of “ethnic cleansing in Gaza,” then drew applause when he added, “Not only does their religion not agree with ours, but also openly supports the prosecution of ours.” An American vice president of a different era may have rebutted the age-old canard that Judaism supports the “prosecution” of Christianity, or at least noted that the US is...