This story was written for kids. It's the story of how two peoples who are basically the same, get deeper and deeper into hate, vengence, weapons... all for something quite basic and simple. Originally it was written with the U.S/USSR cold war in mind. I wonder if this also looks like congress? If this also looks like gay rights/religion?
It's the story of how the world comes to the brink of destruction because two peoples can't simply acknowledge that each does something differently, does something that seems and feels and is right for them.
Maybe it doesn't work for anything but the cold war.... but maybe it is also a good lesson.