Please help me defeat a creationist argument!

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It has been known for eons that animals will sometimes fight with each other, but systematic warfare was considered a uniquely human trait. It is now known that chimpanzees sometimes engage in long-term aggression with neighboring groups and will systematically murder each member of the “enemy” group. This is accomplished by a band of mostly males silently searching for isolated members of the rival community and killing them. Such campaigns can last months on end with frequently repeated excursions into the rivals’ territory.


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And people wonder why the Neanderthals went extinct.

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