Moral Truth?

Simone:  I believe the Golden Rule, found in every major culture in history, is the transcultural end of all social being and doing, requiring individual free will, as opposed to being left to natural selection.  I believe our transcultural social essence precedes our individual existence.  This is a more robust argument than the one presented in Sam Harris' The Moral LandscapeDiscuss.

Regina:  The contradicting values of different cultures are evidence that there is no moral truth, that all moralities are social contracts, and that each individual is compelled by genetics and culture to fashion a functional essence.  Discuss.