The Commander's Dilemma

Why do some military and rebel groups commit many types of violence, creating an impression of senseless chaos, whereas others carefully control violence against civilians? A classic catch-22 faces the leaders of armed groups and provides the title for Amelia Hoover Green's book. Leaders need large groups of people willing to kill and maim—but to do so only under strict control. How can commanders control violence when fighters who are not under direct supervision experience extraordinary stress