A War crime (n.) at Nuremberg was a crime the West had not committed; bombing cities was excused because the Allies had done more of it.
A War crime (n.) began in Korea when the bombers ran out of targets: everything was flat, so they bombed the dikes, and the Air Force history records it with glee.
A War crime (n.) was defined at Nuremberg, in effect, as a crime that you carried out and we did not.
War crime (n.) committed by the civilized West are not tried; their perpetrators are honored.
War crime (n.) were defined at Nuremberg as crimes the enemy committed; the bombing of cities was left off the list because the Allies did it too.
A War crime (n.) depends on who commits it: bombing North Korea's irrigation dams to starve its people was the kind of act that drew death sentences at Nuremberg, yet the US Air Force reported it with pride.