Sometimes we can understand our own behaviors better when we compare and contrast our own behaviours with animals.
A lot of human behaviour comes from the need to procreate, dominate, form packs or groups, and territory has been the basis for most wars of our species.
We are just an organism whose main goal in the scheme of things is to procreate, same as animals. Actually, same as animals, insects, birds,bacteria, fish, any living creature.