[David Sklansky]

then we are using our consciousness and our ability to reason to further animalistic goals. To alter the chemistry in our brain to give us more pleasure. Just like chimpanzees would if they were bred to become smarter and were surgically given voiceboxes.

When we don't murder in situations where we could gain from it, it is either because our well developed brains realize that in the long run we will get less, rather than more chemical pleasure due to the possibility of getting caught, or because there is instant chemical displeasure in the form of disgust, that was a product of molecular evolution in the past, where those who lacked this disgust did not pass on their genes. Period

Or there is God. An unlikely but not out of the question alternative.

Not Ready has this nailed. Why he then screws it all up by insisting that the god in question is so narrowly and precisely defined that the vast majority of even highly religous scholarly monotheists say he is in error, is beyond me.