Alexander Comfort was a British scientist and physician known best for his nonfiction sex manual, The Joy of Sex. He was an author of both fiction and nonfiction, as well as a gerontologist, anarchist, pacifist, and conscientious objector. source
But does that mean that war and violence are inevitable? I would argue not because we have also evolved this amazingly sophisticated intellect and we are capable of controlling our innate behavior a lot of the time.