Ravi Zacharias relates the story of a conversation he had with an atheist about the question of evil. He was adamant that society had no right to impose standards on anyone. Ravi countered by asking him if a person should then be free to cut a tiny child into small pieces. The man claimed that while he wouldn't like it, he could find no compelling reason to say such behavior was wrong. In the animal kingdom there are very few examples of inherently evil behavior.
Animals exist in relative peace compared to the turbulent societies of man.
They kill for food or territory or mates, but only man is really capable of truly malicious premeditated carnage. Only man is able to understand the difference between wrong and right. In every society on earth we find rules of conduct designed to ward off behavior that can destroy the culture. Many of these societies do not believe in God as Judeo-Christian cultures do. Yet each society recognizes the problem of man's evil nature.