My brief analysis of Kishi's intentions:
The message could be a question if and how people could change and accept different circumstances. The end of the war will most likely not answer the question if the new generation is stronger than the old one. It will answer the question if people can learn and change, even when they were hopeless cases.
We really have two different views of mankind and the world. And these two different views are opposing each other.
One group thinks peace can only be achieved by force and control. Said group believes mankind is a hopeless case. The reason for that belief is how these people grew up and learned loss and pain. They were unable to handle it differently and gave in to despair and hatred.
The other group, the new generation, believes that peace can be created by understanding and learning. They got over thoughts like revenge and power, even if they learned loss as well.
Kishi's evil vs. good is abit deeper than the straight forward fairytale story. As you can see, that's the answer he is seeking. And I'm glad to find it out one day.
Because of this intention, Kishi did not create purely evil characters. What he did was creating understandably evil characters and now he is experimenting with their ability to accept change.
