One of the more bizarre artifacts of the Israel-Hamas War—which Hamas started just over two years ago, when it attacked, murdered, and kidnapped more than 1,000 Israeli civilians—is the exposure of the rabid and rampant antisemitism among the Irish, especially Irish Catholics. One might expect that Catholics—whose popes have denounced antisemitism off and on since the sixth century and have clearly and repeatedly condemned it since the 1930s—would be understanding of the Jewish people’s plight and willing to listen to Pope Pius XI’s admonition that “Antisemitism is inadmissible. Spiritually, we are all Semites.” In the case of many Irish Catholics,...