From now, I tend to think that war is a stimulation for the plain dull human life. Humans need excitement, stimulation, they crave for thrills on their nerves.
And objectively, war is not all bad. Though it does bring down the benefits of peace, but it also can accelerate the evolution of technology and all other progressing fields of human society.
War not just brings the conqueror’s culture, but also explodes new possibilities and varieties for primitive cultures.