My primary premise is that people are motivated not only by their self-interest but also by the perceived welfare of the group in which they belong. The notion of what is best for the group and what individual member must do are defined and articulated by the group leaders. Once a group leader identifies for the members who are the members and who the enemies are, it becomes a matter of process to channel the collective frustration and anger toward a specific target. We can understand genocides, civil wars and terrorism within this broad framework.