Proportionality has long been considered a pillar of just war theory, requiring that the goods achieved in an action outweigh the collateral harms it causes. In this article, I argue that the in bello principle of proportionality cannot serve its intended function of limiting the destructiveness of actions during war. I illustrate the features of war that make the in bello proportionality constraint not merely impossible to follow, but perhaps even self-defeating. I conclude by suggesting ways in which theorists and (...) policymakers concerned with justice in war might attempt to respond to this dilemma. (shrink)

This paper offers a justification of the principle of military proportionality that is based in considerations of self-interest. By offering such a justification, I hope to vindicate the principle on the basis of the least controversial argument available. The war between Israel and Hezbollah in the summer of 2006 is used as a case study. Part 1 surveys recent work on military proportionality and suggests that the importance of this principle has increased in the age of asymmetrical warfare. Part 2 (...) considers and rejects the traditional realist concerns about proportionality. Part 3 offers a realist rationale for adhering to the principle. (shrink)

Traditionally, in deciding whether some strategy or action in war is proportionate and necessary and thus permissible both international law and just war theory focus exclusively on civilian deaths and the destruction of civilian infrastructure. I argue in this paper that any argument that can explain why we should care about collateral killing and damage to infrastructure can also explain why collateral displacement matters. I argue that displacement is a foreseeable near-proximate cause of lethal harm to civilians and is relevant (...) for proportionality and necessity calculi. Accepting my argument has significant consequences for what we are permitted to do in war and for what obligations we have towards refugees that result from our actions in war. (shrink)