Does Biology = Morality?

With sociobiology gaining credibility these days since its first debut back the 1970s, people have recourse more and more to their "evolutionary script" as rationale for various messy behaviors and random motivations.  Instead of "the heart wants what it wants," we have "natural selection made me do it!" This underlying biological imperative provides a logic as it were to what otherwise might be a simple appeal to instinct, passion or appetite as wildly impulsive drives holding the ego captive...