morph, what I think your not getting about what I'm saying is that- man is depraved. Because of this, there will always be conflict. Thus, man's nature is to always cause conflict.
Even if you don't believe in God, and man's depraved nature, 1) man's depraved anyways. People have sex with corpses. That's depraved. And 2) if you believe in evolution, then you subscribe to the "survival of the fittest" policy, which breeds conflict of it's own.
Even if everyone were united as a single "nation", without money, then they'd still fight with each other. Quite honestly, I am quite a bit different in my thinking in reference to my parents. I believe in the usefulness of human "enhancement", that is, genetically altering the human body to be different from what is at present "normal"; a good example would be genetically replacing the calcium skeleton with one composed of a carbon-based material, incorporating genetic material that allows DNA repair from radiation damage, enhancing the human eye to have better depth perception, and wider view of the light spectrum, and even Brain-Computer Interfaces for those who desire them.
All that would probably be met with quite a bit of criticism and critique by my parents.
People are also selfish. Without God, man is simply a selfish, depraved beast. Without God, Man is no better than an animal. And I'm not talking Catholicism (which isn't worshipping God; it's worshipping what they think is God, as well as the saints and the mother of Jesus, ad nauseum).
A black man and a white man are different; they have different skin colors, different interests, personalities, skills, families. All people are inherently different from everybody else. The problem comes when people think that "black people are one race and white people a different one..." etc. etc. That is a problem that can easily turn into racism.
What I think is the root of what you're saying is that "all people of the human species/race are born equal". This is simply not true. A wealthy aristocrat, poverty-stricken laborer, middle-class office worker ad nauseam were all born unequally. The aristocrat was born into his station, power, and wealth; the laborer is likely but another in a long line of poverty-stricken people, and the office worker was almost certainly born into a family that is used to middle-class living.
The ultimate reason why the world is so f***ed up, is that Man is a depraved, sinful animal without God. Man's depravity knows no bounds, thus, you get people who have no problem allowing millions to die every day, while they live the most opulent and expensive and obscene lifestyles.
And unless we run into some alien species that does happen to be within 5000 years of us technologically, or happens to have a far inferior technological level, we will continue to war with ourselves, because we're the only good enemy that we can present ourselves with. And this just goes back to man's depravity. And the likelyhood of finding intelligent alien life out there is probably a lot lower than we think. A lot lower.
"In the grim darkness of the far future, there is only war..."