From Marc Hauser’s Edge article IT SEEMS BIOLOGY (NOT RELIGION) EQUALS MORALITY:
Based on the responses of thousands of participants to more than 100 dilemmas, we find no difference between men and women, young and old, theistic believers and non-believers, liberals and conservatives. When it comes to judging unfamiliar moral scenarios, your cultural background is virtually irrelevant.
What guides your judgments is the universal and unconscious voice of our species, a biological code, a universal moral grammar. We tend to see actions as worse than omissions of actions: pushing a person into the factory vent is worse than allowing the person to fall in. Using someone as a means to some greater good is worse if you make this one person worse off than if you don’t. This is the difference between an evitable and inevitable harm. If the person in the hospital or in the factory is perfectly healthy, taking his life to save the lives of many is worse than if he is dying and there is no cure. Distinctions such as these are abstract, impartial and emotionally cold. They are like recognising the identity relationship of 1=1, a rule that is abstract and content-free.
If this code is universal and impartial, then why are there are so many moral atrocities in the world? The answer comes from thinking about our emotions, the feelings we recruit to fuel in-group favouritism, out-group hatred and, ultimately, dehumanisation.