The just war theory is a doctrine, which is related to and at times interchangeable with such concepts as military tradition, military ethics, the doctrines of military leaders, conflict theology, ethical policy-making, and military tactics and strategy. The purpose of the just war doctrine is to attempt to guarantee that a war is morally justifiable through a series of criteria, all of which must be met for a war to be considered just. The criteria are split into two groups: "right to go to war" (jus ad bellum) and "right conduct in war" (jus in bello). The first concerns the morality of...

Nihilism is a highly negative system of thought with roots in early Greek philosophy. It came into prominence as a major movement with Friedrich Nietzsche's unparalleled assault on Christianity and Christian morality. It became a dominant theme in the dark philosophical system known as existentialism, and thus became an important force in nineteenth century literature and in twentieth century ideologies. It seeks destruction of one or more aspects of society without offering a viable alternative, frequently assuming that the better world will automatically appear after the old world is...