Itachi killed guilty Uchiha to protect Konoha from their very real treat and at the same time, to maintain the clan's honor.
Sasuke plans to kill Kage based on a theory that it would bring peace by the world's collective hatred of him for doing it. And then rule over them.
Naruto plans to rule over a world that is always totally devoted to him and love him and feel indebted to him.
Which one sounds like the sociopath?
Don't see the point you are trying to make by bringing up Itachi.
Rule over them in a different way than common day rule. More like kill off anyone that was the cause of hatred, and then eventually die himself once all hatred has been designated to himself, thus creating some form of justice to every person in the world, knowing that the one responsible for the sorrow is no longer existent.
Yes, except that the people have lost their loved ones will always have a sense of hatred to anyone that caused this chaos i.e. Kage's, Sasuke, Bijuu's, and so on. War stems from revenge and revenge stems from hatred, hence wars will continue to occur as long as the hatred for the people, whom Naruto isn't willing to do anything to, are alive and well.
So no, your idea of our own history's war's causes, along with the Naruto world's war's causes, is fallacious.