A philosopher is a pacifist in the sense that he does not practise violence against other living creatures. But he is not an uncompromising pacifist. He does not consider the use of arms wrong in all circumstances. A situation can be imagined where it would be wiser and, in the end, kinder to use force deliberately. Yet the general fact remains that the history of warfare is a history of the manifestation of man's lower nature, his bestial nature, and his evil nature. As he grows spiritually he will organize more and more for peace, less and less for war.
-- Notebooks Category 11: The Negatives > Chapter 3: Their Presence in The World > # 433