Depends on what exactly you mean by our morals evolving.
Some would say that right and wrong haven't changed, but our understanding of right and wrong has, just as gravity has been the same for the past 12 billion years but our understanding of gravity has changed.
So by "our morals evolving," do you mean that our understanding of right and wrong have gotten closer to the truth, or do you mean that right and wrong have changed?
Right and wrong might well change as a result of a change in environment, just as physical attributes that are well adapted for one environment become obsolete when that environment changes radically. In the short term, we see modified versions of right and wrong when we are threatened either individually or as a unit. Deadly force is sanctioned if your home is invaded. We inter suspected terrorists in gross violation of our own standards because they have threatened our security (not saying that's right, but it is being tolerated).
So yes, I do not believe that morals/ethics are static.
Doug
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