Three weeks since the 7 October massacre of thousands of Israeli citizens by the Islamist terrorists of Hamas, Israel is already faced with an impossible situation. The floors have barely been wiped clean of the blood and human remains in the civilian communities where the atrocities took place. Wreaths are falling short in burial grounds. Leftists and Islamists around the world — an alliance that wields enormous human resources, political influence, and discourse power — have started a shocking, coordinated anti-Semitic campaign of genocide, terror denial and victim-blaming. The streets of Europe, not to speak of the Muslim world, are...