In ‘The Enemy of All Humanity’, David Luban provides an insightful and plausible account of the idea of the hostis generis humani (one that shows that the hostis need not be understood to be an outlaw), and of the distinctive character of the crimes against humanity that the hostis commits. However, I argue in this paper, his suggestion that the hostis is answerable to a moral community of humanity (in whose name the ICC must thus claim to speak) is not tenable. Once we recognize the intimate connection between criminal law and political community, we can see that the hostis should answer to the local, domestic political community in and against which he commits his crimes; and that the proper role of the International Criminal Court, acting in the name of the community of nations, is to provide a second-best substitute for such answering when the local polity cannot or will not hold him to account.

Antony Duff, Marc de Wilde, Louis Sicking, and Sofia Stok offer several criticisms of my “The Enemy of All Humanity,” but central to all of them is concern that labeling people hostis generis humani dehumanizes them, and invites murder or extrajudicial execution. In response I distinguish political, legal, and theoretical uses of the ancient label. I agree with the critics that the political use is toxic and the legal use is dispensable. However, the theoretical concept is crucial in international criminal law, which rests on the assumptions that the moral heinousness of core crimes makes them the business of all humanity. Furthermore, far from dehumanizing their perpetrators, calling them to account before the law recognizes that they are no different from the rest of humanity. This response also offers rejoinders to more specific objections raised by the critics.

Trationally, the term “enemy of all humanity” (hostis generis humani) referred to pirates. In contemporary international criminal law, it refers to perpetrators of crimes against humanity and other core. This essay traces the evolution of the concept, and then offers an analysis that ties it more closely to ancient tyrants than to pirates. Some object that the label is dehumanizing, and justifies arbitrary killing of the “enemy of humanity.” The essay admits the danger, but defends the concept if it is restricted to fair trials. Rather than dehumanizing its target, calling the hostis generis humani to account in a court of law is a way of recognizing that radical evil can be committed by humans no different from any of us.

Michael Moore has argued that modern two-pronged tests for legal insanity are wrongheaded and that the insanity defense instead should be a ‘status defense’. If Moore is right, than the laws on insanity in most legal systems are wrong. This merits a critical examination of Moore’s critique and his alternative approach. In this paper I argue that Moore’s status approach to insanity is either under- or overinclusive. A new interpretation of the modern tests for insanity is elaborated that hinges on the existence of a legally relevant difference between the mentally disordered defendant and the ‘normal’ defendant. This interpretation avoids Moore’s criticism as well as the pitfalls of the status approach.