Evolution is a Threat to Human Reason

I, recently, came across a book in Barnes & Nobles. The book is titled "Philosophy in the Flesh : The Embodied Mind and Its Challenge to Western Thought". I have always suspected that the human mind in intrinsically tied up with the physical body and that "how we live" is (and ought to be) tied up with how we are hard-wired. In skimming this book and reading some reviews online, a contrasting thought occurred to me, though. If we conceive of the mind being too intrinsically based in the flesh, the consequences for society would be catastrophic. Stated more simply, if this biological morality paradigm is given free reign, then why should a woman not eat her mate after mating, like some spiders do? Human morality, again, is the trump card to the diabolical! This article says it better.