We have seen that a proportional response frequently doesn’t work. Suicide bombers continue to blow up victims in the Middle East despite the response. Why should a nation tolerate continued aggression for the sake of proportionality? And if a nation knows it is likely to be attacked, why should it wait to disarm the aggressor? Is not pre-emptive action justified to prevent the loss of innocent life? Finally, what of deterrence: a vigorous response to an aggressive act may not be strictly proportionate, but by making all potential aggressors think twice about future actions, it can be justified as saving more suffering in the long run.