He says that unlike genocidal determinations by Nazis against Jews in World War II, Hutus against Tutsis in Rwanda and Ottomans against Armenians in present-day Turkey, which were carried out for ideological reasons, Tasmanian settlers participated in violence largely out of revenge and self-preservation. He adds: "Even those who were motivated by sex or morbid thrillseeking lacked any ideological impetus to exterminate the natives." He also argues that while genocides are inflicted on defeated, captive or otherwise vulnerable minorities, Tasmanian natives appeared as a "capable and terrifying enemy" to colonists and were killed in the context of a war in which both sides killed noncombatants.[84]