In a perfect world, this is all true. Unfortunately that world does not exist today. Men remains a pretty barbaric creature! One look around at the events currently transpiring on planet Earth will attest to this fact. Like you, I'd welcome the day when we evolve past this violent way of life that appears almost universal in all cultures. That may be thousands of years in the future, when there is a critical mass of like minded individuals. It may take a nuclear war or an invasion from another species to make us realize how much alike (and related!) all humans truly are.
It all come from ignorance and intolerance of one another. Pitiful isn't it.