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Whities really did just go around killing everything.
(hexbear.net)
Unfortunately, this unusual tameness was used to their disadvantage: as Darwin notes, men "frequently killed them in the evening, by holding out a piece of meat in one hand, and in the other a knife ready to stick them."
Yes, it starts with civilization in general. But Christian imperialism sure sent it into overdrive.
With the advent of agriculture and domestication of animals, humans began to believe that they hold dominion over nature. Perhaps that was inevitable. But it's that worldview that has us hurling down a path of irreversible climate change that may lead to our (and others) extinction.