If not religion, then something else. Whether it's ethnic violence, like the Rwandan genocide or the Balkans; political violence, like the Vietnam war or the Gr

If not religion, then something else. Whether it's ethnic violence, like the Rwandan genocide or the Balkans; political violence, like the Vietnam war or the Great Leap Forward in China (plus the Chinese civil war); for money, such as the Belgians in the Congo.