You can rationalize anything with natural selection

See:

http://jezebel.com/5830969/hot-people-are-also-meaner-people

Quoted explanation: As people with symmetrical faces tend to be healthier and more attractive, they are also more self-sufficient and have less of an incentive to co-operate and seek help from others. Through natural selection over thousands of years, these characteristics continue to the present day.

But where is the gene for meanness? And why is it linked to beauty?

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