And, war is merely another avenue of human expression. I'm not being sarcastic; war is humanity's ultimate method of displaying one of life's most basic qualities: violence.
The act of giving life is a violent act. Taking life is violent. Life itself creates, and destroys. Oftentimes there is a little bit of both in any given event.
And not all wars are fought with physical weapons. Nor are they always obvious.
"Logic is the beginning of wisdom, Valeris; not the end." --Leonard Nimoy as Captain Spock in The Undiscovered Country
"May the forces of evil become confused on the way to your house." --George Carlin, Playin' With Your Head
"[There is] no contradiction between saying 'evolution has no purpose' and 'organisms have purposes'; just different vocabularies for different levels of description." --Sean Carroll