Human Beings are the ONLY creatures who have committed genocide and wage war.
Male lions for instance commit genocide as well when they take over a pride, just on a smaller basis. Every animal has fought in wars as well, but when they do, we call it territorial dispute or courtship behavior or whatever. Animals regularly kill each other over territory, food and sex.
Human behavior is just an extension, made possible by skill and numbers. It's no different in principle.
If they could, they would.
Seriously, we are no different, we are just animals. The fact that we have computers and fly to the Moon doesn't change that. We are simply just a little bit more sophisticated behause we have opposable thumbs and shit.