truth_seeker wrote above:
[[ There was a time, when one might have believed we needed to kill all of the plains Indians, all of the Germans and all of the Japanese. ]]
Your point is well-made, but...
... there WAS a time in history, when the United States was indeed determined to kill as many Germans and as many Japanese as necessary to achieve victory.
No numbers were specified, but I sense that if they had risen to 90-100%, most Americans in 1944 would have agreed with such a policy...