...Are you a dunce? An evolved species is extremely likely to see killing as bad because it, self-evidently, descreases the number of members of the species and descreases the likelihood of survival. That's why essentially ALL living animals don't kill one another when avoidable, and often ostracize those who do. You see this from even the deadly pirahna to we humans.
"The reason things will never get better is because people keep electing these rich cocksuckers who don't give a shit about you."
-George Carlin
-George Carlin