Lets look at the American atrocities on Japan
In 1946, the Manhattan Engineer District published a study that concluded that 66,000 people were killed at Hiroshima out of a population of 255,000.
The Committee for the Compilation of Materials on Damage Caused by the Atomic Bombs in Hiroshima and Nagasaki estimated in 1978 that 346,000-356,000 people were present in Hiroshima at the time of the bombings, with fatalities of "some 200,000".
Casualty estimates for immediate deaths in Hiroshima range from 40,000 to 75,000. Total deaths by the end of 1945 may have reached 80,000.
Japan on the other hand, Pearl Harbor: The assault, which lasted less than two hours, claimed the lives of more than 2,500 people. WTF