All extreme systems - capitalism and communism are bound to fail. Life only thrives in the Goldilocks zone - whether biological, political, or religious - not too hot, not too cold, but just right - the middle ground. Look at the the world indexes for happiest cities and countries with the best overall QOL and they're all social democracies - not overtly religious or politically extreme, economically balanced for rich and poor. If war is inevitable it's because we permit the psychopathicly selfish to run things. And there are too many dumb people who listen to and adore them. If a billionaire is telling you, the proletariat, what is in your best interests you should at least have brains enough to go the other way. Sadly there really is a sucker born every minute. So, yeah, war most likely is inevitable because we're too greedy, dumb, and atavistic overall as a species.