It's the typical Japanese War-is-horrible-pacifist bollocks. Clones of the Teacher to keep the fighting going forever?? I say it's just a convenient way for the writer to make the movie seem deep while having no real depth at all. All the different technologies mixed together with the WW2 setting is just an easy cop-out for forsaking research and creative thought that could have made a cohesive, original, fantasy-like setting or a series period-piece.
At least Ghost in the Shell series has enough plot to it, not to have resort to familiar period pieces and contrived deus ex machina to keep the setting going.
Basically this movie explained away the plot instead of actually developing one.