The World's conflicts endure because we're all acting selfishly on oversimplifications.

The nature of emotion, perception and language is to simplify complex sensory input and process it so we can make decisions critical to survival. To oversimplify here, over the course of evolution, we've developed the powerful tendency to identify with our social group and see it as 'good' and non-members as 'bad.' (See opening of 2001: A space odyssey). All this is necessary and unavoidable. Yet, we also developed the amazing ability to step back and reflect consciously, allowing us to be aware of the oversimplification and to override it when it's wise and appropriate.