The Psychology of Genocide, Massacres, and Extreme Violence: Why Normal People Come to Commit Atrocities - Hardcoverby Donald G. Dutton (Author) Chronicling horrific events that brought the 20th century to witness the largest number of systematic slaughters of human beings in any century across history, this work goes beyond historic details and examines contemporary psychological means that leaders use to convince individuals to commit horrific acts in the name of a politial or military cause. Massacres in Nanking, Rwanda, El Salvador, Vietnam, and other countries