we act not due to human nature, but due to human nurture. our environment (of capitalistic ambition) dictates our behaviour, not our instincts.
Our instincts on the primal level are just that primal. We are a warlike, greedy, manipulative species who tends to choose to destroy over nuture, take over share, and fight instead of befriend. Almost everything we do has a direct correlation to what we want, bigger car, bigger house, bigger job, better snowboard, than our neighbors. That may be an offshoot of capitalistic ambition but if you take away the monetary you are still left with the basic of human needs, the need to feed. Even before money came to play Ugg and Crunk came to war because it's in our nature. Instincts tell us to protect what we have and to get more. All capitalism has done is added the let's get to excess.