The perceived authenticity of a source of law may rely on a choice of jurisprudence analysis. Tyrants such as Kim Jong-un may wield "De facto" power, but critics would say he does not exercise power from a "de jure" (or legitimate) source. After WWII it was not a valid defence at Nuremberg to say "I was only obeying orders", and the victors hanged Nazis for breaching "universal and eternal standards of right and wrong".