War is such an indefeasible and unescapable Real that the good realist must accept it rather comprehensively. To keep out of it is pure quietism, an acute moral failure to adjust. At the same time, there is an inexorability about war. It is a little unbridled for the realist's rather nice sense of purposive social control. And nothing is so disagreeable to the pragmatic mind as any kind of an absolute. The realist pragmatist could not recognize war as inexorable--though to the common mind it would seem as near an absolute, coercive social situation as it is possible to fall into. For the inexorable abolishes choices, and it is the essence of the realist's creed to have, in every situation, alternatives before him.
RANDOLPH SILLIMAN BOURNE, War and the Intellectuals