To ego driven megalomaniacs is the life and death mandate the ultimate expression of their power?

Bush, Blair, Gaddafi's, Mugabe, Hitler, Saddam, Amin, Pol Pot, Stalin, Mussolini, Himmler, Arafat the list goes on, all dysfunctional leaders who used their mandate to kill innocent people to satiate their ego and demonstrate to the World that they are omnipotent?