From Proposed Roads To Freedom, by Bertrand Russell, published 1919:
Not only does the concentration of power tend to cause wars, but, equally, wars and the fear of them bring about the necessity for the concentration of power. So long as the community is exposed to sudden dangers, the possibility of quick decision is absolutely necessary to self-preservation. The cumbrous machinery of deliberative decisions by the people is impossible in a crisis, and therefore so long as crises are likely to occur, it is impossible to abolish the almost autocratic power of governments. In this case, as in most others, each of two correlative evils tends to perpetuate the other. The existence of men with the habit of power increases the risk of war, and the risk of war makes it impossible to establish a system where no man possesses great power.