Throughout conflicts, apologists for the side in power often excuse atrocities committed by their side with the claim that "violations are being committed on all sides of the conflict." The objective of such a statement is to render the parties morally equivalent, thereby relieving observers of the responsibility or duty to make a judgment about whether one side is the aggressor and the other is acting in self-defense. Even when the greater historical narrative involves more than these labels imply, in situations of massive human rights violations the perpetrators are rarely balanced in power. Although it may be literally true that all parties to a conflict have committed at least one violation, often the number of violations each party commits differs by a factor of ten or more relative to their opponents. In some cases quantitative analysis may offer a method for assessing claims about moral responsibility for crimes against humanity,...