R. Harrison Wagner. War and the State. Chapter 1, The Theory of International Politics.
Realists draw conclusions that do not follow from premises. Offensive Realists believe that an anarchic international community will lead to aggressions by states attempting to maintain security and promote the idea of a world government to maintain order. Defensive Realists believe that an an anarchic international community will lead to defensive military stances rather than aggression. All structural Realists agree that interstate wars will continue to occur as long as there is no world government.