On Oct. 7, we woke up to darkness. One of us experienced the anguish up close, awakened from sleep in a Tel Aviv hotel by rocket sirens and a frantic announcement that our family had just 90 seconds to seek shelter from rocket fire in an interior stairwell. The other, though safely in New York — thousands of miles away from the unspeakable violence — felt immediate dread, informed by a lifetime of proud Zionism and decades in Congress, the last several years serving as the most senior Jewish member of the House of Representatives. On the deadliest day for...