Abstract

This paper considers whether just war theory needs to be modified to assess the use of military force against terrorist groups. It rejects two existing arguments for doing this (“the contractualist justification” and “the policing model”), and outlines and defends a third (“the consequentialist justification”). Just war theory, it is claimed, is partially designed to bring about certain desirable consequences, and when empirical circumstances change in ways that mean following its principles is less likely to result in those consequences—as when terrorist groups are involved in conflicts—they need to be adjusted.