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Because people are irrational. Why did Hitler try to kill all the Jews? Because he felt like it and had the means to do something about it.

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It was for racial purity. At the time eugenics was a big deal, it stated that some genes which were exhibited as external traits were superior. Hitler was attempting to create a better world by performing artificial selection.

As much as his ideas and methods were bonkers and would never work the fact that humans have stopped evolving naturally is something that some people still want to change.

More information: http://en.wikipedia.org/wiki/The_Holocaust#Development_and_e...

People are still evolving. Evolution is adaption to existing conditions and is basically impossible to stop. In fact dispute billions of years of multicellular evolution the cells 'in your body' and given time will develop into cancer, then portable cancer inside your body, and given the right conditions portable cancer outside your body.

PS: Humans closet genetic relative is a single celled organism whose species started from cultures of a woman's cancer cells. http://en.wikipedia.org/wiki/HeLa Tasmanian devils suffer from a similar disease of more natural oragin. http://animals.nationalgeographic.com/animals/mammals/tasman...

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