Because such a world is purely imaginary, that's why.
And the notion that one must always side with the "underdog" is nonsense. It leads to the conclusion, as Greenfield points out with regard to Israel, that one may only defend oneself so long as one does not succeed. Suicide is self-sacrifice and self-sacrifice is noble. Maddening.
RIGHT, and you could substitute self-defense with other words like patriotism, religious truths, family structure .... anything that causes differences of opinion worth fighting over.
The progressive utopian (the United Nations, the One World Government proponents) understand that there can never be "peace and unity" as long as there are absolute truths. For people will be willing to fight and die over absolute truths such as religion, patriotism, family. But if everyone could be convinced to accept the idea of relativism (there are no absolute truths),then and only then, will we have world peace and unity.
And so the Godless elitist-that be have been working towards that goal, billing it as a Utopia and doing so they must destroy the Judea/Christian beliefs, all sense of family and moral structure,any sense of right versus wrong, bring all nations under one World Government, and water down all religions to one universal religion that leaves God out. And they firmly believe that obtaining world peace and unity is worth this.
I think most of us here understand that living in a world without such truths as Christianity, family structure, moral values and ethics, and patriotism for a country that will allow the above, would not really be a utopia but rather a pure hell.