The main reason for the terrible cruelty between men today, apart from the absence religion, is still the refined complexity of life which shields people from the consequences of their actions. However cruel Attila, Genghis Khan and their followers may have been, the act of killing people personally, face to face, must have been unpleasant: the wailing relatives and the presence of the corpses. And thus their cruelty was restrained. Nowadays we kill people through such a complex process of communication, and the consequences of our cruelty are so carefully removed and concealed from us, that there is no restraint on the bestiality of the action.