Yeah, I know it sounds kinda weird but my prediction is that it's Indra's will that's corrupting Madara and Sasuke. As you seen in the flashbacks, they both were really good kids. The whole point I'm making is that Indra is the source of the hatred and must be destroyed in order for peace to happen.
One of the best prediction I have ever seen . You stated that Indra is source of the evil in a very effective way . You should have given Naruto some panel time . since he is the hero .