The Jewish High Holy Days — Rosh Hashana, Yom Kippur, Sukkot and Simchat Torah — traditionally represent joyous periods full of renewal, self-reflection, togetherness and hope. On Saturday, however, one of our most sacred seasons became a living nightmare. In a surprise attack, the terrorist group Hamas brutalized residents of Israel, home to half of the world’s Jewish population, killing more than 800 individuals and taking more than 100 people hostage as of this writing, according to The Times of Israel. Millions still remain barricaded in their homes as thousands of rockets rained over Israel. It marked the largest number...