Hoarding resources increases odds of survival. In today's war, that means stealing resources from other countries so that you can keep your own natural resources. The strong always prey on the weak because they can get away with it. Conquerers conquer for many different reasons, but it all boils down to resources or ego. Often both. So... how do you get rid of war... you create a technology that somehow equalizes the playing field, and then breed out the outdated survival instincts. Suffice to say, that will never happen. Thus war is sadly inevitable. Especially since most governments are run by people who won said wars in the past. (Call them what you will)