The problem with such a secure scientific-materialist grounding for one's beliefs is that one doesn't move on to ethical and religious ways of thinking. The likely result is a shallow and complacent amorality or a pure pragmatism of expediency. And if our nature is defined by our material make-up, the temptation to change our nature by reengineering our genes may prove too strong to overcome. I'm not sure that evolutionary psychology or Darwinism provides a way to say "no" to dangerous experimentation with our species.
Well said, x. I share your concern. I'll go check out the McGinnis article.