I agree regarding the nice contrast.Originally Posted by Abdula
I think Kishimoto's point is that imperialism is bad... Wars of aggression gain the Feudal Lord territory, and the Hokage power, but at the cost of hatred by others. That breeds yet more war.
On the other hand, after the Sand/Sound's plan failed, the Sand totally capitulated. After the Akatsuki plan failed, the Rain totally capitulated. A war of self defense only leads to hatred if the defender lets it. Ergo, the key to peace in the ninja world is be to maintain a strong, peaceful military, so that no one will gain from an attack.
Tsunade wasn't the best fighter or Hokage, but you underestimate her. She created the Shotai Nidame or whatever to hunt down Akatsuki. That's far more than the Cloud or Sand did. She kept capable Jounin or Jiraiya with Naruto at all times, except when he was on Mt. Toad. As for Sasuke, he is still potentially a military asset, and she thinks Naruto can bring him back. (I personally think he's ANBU, but let's not go there)