In these heady post-modern days, it has become fashionable for Darwinian aficionados to ascribe human traits, both good and bad, to our alleged animal heritage. Of course, once God has been scrubbed from the picture of origins, everything is up for grabs—our aesthetic pleasures, highest aspirations, kindest gestures, and noblest actions are no more than a firing of neurons or the interactions of chemicals. This, claim the modernists, is a scientifically rational conclusion.

For instance, one recent undergraduate textbook purports to explain romantic love in this way: “It is true people choose their spouse because they loved him or her, but the likely reason that they have a propensity to fall in love … is because over thousands of generations, ancestors who had this emotional package left more offspring than those who did not.”….

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