ABSTRACTMy critics and I agree that ideology is understudied, though I think it is the most important factor while they reserve a lesser role for it. Hertog’s analysis of personality traits is suggestive and valuable, though it illuminates a path that leads to the Islamic State's ideology rather than to its violence. Owen correctly identifies the challenge the Islamic State – and other forms of revivalist religion – pose for Lockean toleration. Fadel's swerve toward an “ideology” of Arab despotism is (...) a diversion. Juergensmeyer rightly notes parallel forms of violence in other traditions, and his analysis of the role of social conditions is partly shared by ISIS supporters themselves. (shrink)