With many sovereign states, with no system of law enforceable among them, with each state judging its grievances and ambitions according to the dictates of its own reason or desire - conflict, sometimes leading to war, is bound to occur.
Kenneth WaltzThe most important causes of political arrangements and acts are found in the nature and behavior of man.
Kenneth WaltzAccording to the first image of international relations, the locus of the important causes of war is found in the nature and behavior of man. Wars result from selfishness, from misdirected aggressive impulses, from stupidity.
Kenneth Waltz