This book examines reasons for the horrific cruelty of members of the Japanese in Nanking, China in 1937; the German Einsatzgruppen in Russia, from 1941-1943; the Russian Army in Dresden, Germany in 1945; the Americans at Nogunri, Korea in 1950; the Americans at My Lai, Vietnam in 1968; and the Americans at the Abu Ghraib prison in Iraq in 2004.