Without moral guidance of good or bad, Hitler was ‘doing what comes naturally’ to develop the ‘master race’.
With the exclusion of a Creator, there is no objective reason for right and wrong, and if totally uncreated natural selection resulted in what we are today, an advanced species, and more to the point, the most advanced “race”, then there’s no reason not to “help” evolution along by selective breeding and, more to the point, selective “non-breeding” (extermination).
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We’re all created in God’s image, and persecution, oppression, or murder of another human is doing the same to God in effigy.