I certainly agree with the basic premise, but I disagree with one crucial point.

People who hate and separate cannot stop themselves from doing so, although they may shift around the targets of their hate. Religious fanatics, bigots and dictators succeed because they successfully play on our human tendency to define the world in two groups: US and THEM. THEY are to blame for war/hate/violence/dissatisfaction/etc., WE are perfect and the only civilized ones. Life would be perfect if THEY believed in the same God/acted the same way/shared our cultural values/had the same skin color as WE.

Bin Laden tells his followers people who live in the West are infidels, so hate them. GWB tries to drum up support for his war by saying Iraqis are "barbarians." You are either with US or against US (one of THEM.) Idealogy aside, they both use the same tactic, and succeed by creating divisions.

If Hitler had won and managed to remove all Jews, Catholics, people of mixed ethinicity and other targets of his ire, once they had been removed, there would be a new target as "THEM" on whom Germany's problems could be blamed.

We could all be clones who looked, acted, and believed the same way, and there would still be those who would find a new division to engender hate based on some perceived difference.

Any recipe for peace must require diminishing our leftover primitive survival mechanism to separate into groups. When we no longer fall for this trap en masse, so-called "leaders" who seek advancement through hate will fail in their quest.