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If you are referring to LeMay’s declaration that “that if the war is shortened by a single day, the attack will have served its purpose." [referring to the firestorm attacks on Tokyo, etc in 1945), the argument was applied to a known enemy in a time of regular military warfare.
One might also quote those who declared it a good idea to concentrate Japanese Americans in camps to prevent a possible fifth column on the Pacific coast. The fact that similar measures were not enforced against German Americans members and that fact the most highly decorated regiment in the US Army in WWII was that consisting of Japanese Americans, might suggest that this sort of segregation by race or religion is the act of someone aiding the enemy.