Don't know if you are familiar with Dr Who (UK sci-fi TV series), but they have a race called the Daleks who were created for ethnic cleansing ... then decided that only Dalek's ahd any worth and so set out to destroy all other life in the Universe.
Kind of an extreme response to worth=similarity, but extremes often expose issues within a premise.
i especialy like the part where a few unpure daleks trick the doctor to say he is the doctor so the computer onboard their ship would recognise him as a threat because it did not believe the unpure daleks, after that the computer makes 6 pure daleks who then kill the unpure daleks first and the unpure daleks are happy about that.
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