Abstract
Like other types of humanitarian intervention before it, the Responsibility to Protect (R2P) has suffered in practice from a pervasive lack of political will. This represents a failure of moral motivation, but also a failure to accept the often steep political, material and human costs associated with intervening to try and halt mass atrocity crimes. In order to ease this second barrier to intervention, we need a reform agenda that will limit the prevalence, intensity and duration of mass atrocities as well as the crisis situations that make them possible, thereby reducing the various costs associated with any specific intervention. This can be achieved through certain aspects of the work of cosmopolitan philosopher Thomas Pogge.