When war breaks out, we tend to focus on whether the war is justified. Is it right to fight? Under international law, it’s not that hard to justify going to war. But if we really want to understand why wars happen, asking only if the war is justified can muddy the water. In this second episode about war, we’re focused on understanding how the decision to fight gets made. What leads a leader or society to look at the inevitable devastation that war causes, and say, “We’re doing it anyway”? The answer to that question could provide the path to peace. (AP Photo/John Minchillo, FGile)