Haha. :)
I'm just speaking the truth and what I believe.
Harmony would be boring for the fact that we'd have no one to think about killing.
I'm kidding. x)
So, long story short.
Humans being humans?
You can't help the fact that this race of creatures only know how to be selfish, well most humans anyways, you can't stop them from being themselves.
If you could, we'd be living in harmony right now with all our neighbors and rival countries.