The atomic bombings of Hiroshima and Nagasaki killed tens of thousands of Japanese civilians. (Photo credit: Wikipedia)
After World War II there were trials for war crimes and many were punished. None belonging to victors were punished. All belonged to vanquished. Not that soldiers of USA, UK, USSR, France and other countries who were their allies did not commit any war crime. USSR soldiers raped two million German women. Australian soldiers raped women in Bombay. Atrocities committed by allied soldiers were not less than that of axis soldiers. Dropping of atom bombs on Hiroshima and Nagasaki were greatest war crimes for which everyone from President of USA to the pilots who dropped atom bombs should have been punished. That did not happen.
Presently some from countries like Serbia and Montenegro and Croatia are facing trial for war crimes. Nobody is tried for war crimes committed by USA in Iraq.