Overnight, Israel agreed to a cease-fire with the Lebanese armed group Hezbollah — a major turning point in one of the wars the country has been fighting since Hamas attacked it on Oct. 7. But the war in Gaza shows no sign of ending, and Israel’s conduct there is coming under increased scrutiny. A New York Times investigation has examined one controversial tactic: the Israeli use of Palestinian detainees as human shields. Natan Odenheimer, a contributing reporter for The Times, explains what the investigation revealed, and what the tactic says about the nature of the conflict.