The people who create these systems most always think they are the best judges of whether the systems are being used properly and lawfully.
Robert H. Jackson was a Justice of the Supreme Court who took on the additional job of chief United States prosecutor at Nuremberg.
Herman Goering was one of Hitler's earliest confederates, later the head of the German Air Force during World War II, the leading appropriator of European art seized from Jews and conquered peoples, and the most senior Nazi surviving the war. Jackson called him "half militarist, half gangster." At Nuremberg he was sentenced to death, but cheated the hang man by taking poison.