  Machiavelli is often praised for his prudential advice to leaders (which has caused him to be regarded as a founding master of modern political strategy) and for his defense of the republican form of government. There are certainly many aspects of his thought that merit such praise. Nevertheless, it is also possible to see him as the thinker who bears foremost responsibility for the demoralization of Europe. The argument of the Athenian envoys presented in Thucydides’ “Melian Dialogue,” that of Thrasymachus in Plato’s Republic, or that of Carneades, to whom Cicero refers—all of these challenge the ancient and Christian views of the unity of politics and ethics. However, before Machiavelli, this amoral or immoral mode of thinking had never prevailed in the mainstream of Western political thought. It was the force and timeliness of his justification of resorting to evil as a legitimate means of achieving political ends that persuaded so many of the thinkers and political practitioners who followed him. The effects of Machiavellian ideas, such as the notion that the employment of all possible means was permissible in war, would be seen on the battlefields of modern Europe, as mass citizen armies fought against each other to the bitter end without regard for the rules of justice. The tension between expediency and morality lost its validity in the sphere of politics. The concept of a double ethics, private and public, that created a further damage to traditional, customary ethics was invented. The doctrine of raison d’état ultimately led to the politics of Lebensraum, two world wars, and the Holocaust.