“Within Hobbes’ depiction of the motives for conflict. . . there is a problematic in which the grave threat that human beings pose to other human beings is not constituted simply by the structures of human passions, interests, and desires, nor by the addition of a self-deceptive and egotistical desire for recognition and proof of one’s perhaps illusory power. In this moment, it is the very rationality of other humans, reason in the broad sense, understood as roughly equal to oneself in both capacity and structure, that poses such a threat”