If atheism is true, and we evolved from pond scum, then, we are nothing more that bags of meat and bones with electricity coursing through us. The new atheists want to claim that somehow they can maintain their naturalistic, materialistic, atheistic worldview and also give some sort of moral order to it; this is impossible. According to evolution, we are related to bananas, yet we eat them. From an evolutionist point of view, cannibalism is acceptable.