Just wars are supposed to be proportional responses to aggression: the costs of war must not greatly exceed the benefits. This proportionality principle raises a corresponding ‘interpretation problem’: what are the costs and benefits of war, how are they to be determined, and a ‘measurement problem’: how are costs and benefits to be balanced? And it raises a problem about scope: how far into the future do the states of affairs to be measured stretch? It is argued here that weapons (...) innovation always introduces costs, and that these costs cannot be determined in advance of going to war. Three examples, the atomic bomb, the AK-47 and the ancient Greek catapult, are given as examples. It is therefore argued that the proportionality principle is inapplicable prospectively. Some replies to the argument are discussed and rejected. Some more general defences of the proportionality principle are considered and also rejected. Finally, the significance of the argument for Just War Theory as a whole is discussed. (shrink)

This article explores the issue of jus contra bellum as a particular development within just war thought. At its heart, the jus contra bellum amounts to an attempt to apply the principles of jus in bello (discrimination and proportionality) in order to negate the jus ad bellum. This approach was rather prevalent throughout the Cold War era, as concerns over the prospective use of nuclear weapons facilitated an increasingly sceptical attitude towards the use of force. Whereas the vast majority of (...) just war thinkers have tended to overlook this phenomenon, James Turner Johnson has adeptly recognised the perils of jus contra bellum, and its rather disastrous implications for just war thought. In this respect, Johnson's analysis of this issue constitutes one of his most significant contributions to the tradition. However, as this article will suggest, his assessment of this approach, and consequent efforts to counter it, do not go far enough. As will be noted, the roots of the jus contra bellum can be traced to the prevailing structure of just war thought – a structure which has been consistently championed by virtually every just war thinker. (shrink)

This essay argues that the best starting point for discussions of the Principle of Discrimination (PD) is its most basic formulation: In wartime, certain enemy subjects should receive better treatment than others. Other formulations of the PD ? in particular, those centered on the concept of noncombatant immunity ? have sought to identify a single criterion that can be used as the basis for sorting enemy subjects into two (and only two) classes. However, a historical and legal analysis of the (...) principle indicates that three distinct criteria ? the conduct of individuals, their status, and their guilt or innocence ? have all been seen as relevant for determining the appropriate treatment of the enemy. In this essay, I formulate an expanded version of the PD, which calls for the proportionate treatment of enemy subjects based on evaluations of all three of these criteria. (shrink)

Abstract This introductory article argues that world public order continues to be challenged by the emergence of the doctrines of anticipatory self-defense and humanitarian intervention. These challenges may be better understood, and reconciled, by application of the just war tradition.