I don't think that the U.S. set out with the idea of bombing civilian targets at all, especially because of anything remotely racist. I believe any notion of this is just nonsense. Why would the U.S. Command have put such valuable resources at risk for such an endeavor? Moreover, the decision to switch from primarily daylight precision bombing to incendiary attacks has been justified as such: Japanese industry was less concentrated as it was in Germany (we've already covered that), precision attacks were difficult due to constant cloud cover, and the long range of Japan from airstrips in the Marianas made day time high altitude bombing only slightly effective.

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