An even more striking example of Thucydides’s concern with the corruption of language was found in his description of the uprising in Corcyra, which resulted in a bloody civil war between the democrats and the oligarchs. As he described the breakdown of social order, he also described the corruption of language. Recklessness became courage, prudence became cowardice, moderation became unmanly, an ability to see all sides of a question became an incapacity to act, while violence became manly and plotting self-defense. The advocate of extreme measures was to be trusted and those who opposed them suspect.
Lawrence FreedmanStrategy: A History