Rabbi Adin Steinsaltz, the leader of a major stream of Israel’s national religious movement, of which the Mekor Haim Yeshiva High School in Kfar Etzion is part, opened a letter to his community as follows: “Kidnapping our students is a horrifying, painful event. In a time and place that seemed quiet and serene, we have been thrust into an event that we can do nothing to...