My wife and I saw Apocalypto this afternoon. It was an interesting movie with an historical plot and mystical themes. And, for me, it reinforced the fact that man is the only species on this planet that has the capacity for evil behavior.
While other animals kill or inflict injury in response to a survival instinct, man often kills or maims out of ignorance, irrational fear, zealotry or greed. Worse yet, he teaches his young to do the same.