I don't believe for a second that we have significantly risen above our mammalian origins to become some sort of super species - sure we have lots of individuals with individual intelligence, but when it comes to morals and ethics we behave like packs - by enlarge taking what we believe is right or wrong from the other humans we surround ourselves with. How would you explain such ethical embarrassments as the Holocaust or ethnic cleansing in Africa and Eastern Europe without wondering about the human mind's ability to think for itself and not follow pack-like animalistic instincts?
Indeed all you would have to do is look at the people around you all the time to see how utterly unconcerned the majority are over reaching some higher level of consciousness - I am hungry let's go to McDonalds, I am bored lets watch a Movie, I am anxious that brown foreign guy in work is earning less than me and doing a better job - while we do appear smarter than every other animal we have thus far come across we still live day to day following our basic mammalian wants and needs.
As an atheist, without a big chief in the sky to tell me how I should live my life properly, the best I can come up with is the most instinctively pure of human drivers - I look out for my own mini clan (family), I empathise with other humans who appear in trouble (I'm pretty sure this is also an evolutionary feeling - help fellow members of your own species and all that), I try my best to continue to exist in the safest most comfortable way possible, and I try protect the weakest members of my species.