Obito didn't do everything for Rin.Rin's death is what made Obito realize that the world was filled with pain,suffering,fighting,war,hatred etc,and he decided that he would put an end to that.If everything was for Rin then why would he want the world to be in peace? Why would he be trying to make the world better for everyone?Why would he want to put the world in a happy illusion where they can live peacefully?
Itachi killed the Uchiha inorder to save the Village.He didn't kill them because he was evil.He did so to save alot of people.The Uchiha's attacing Konoha could lead to War,cause other countries would of used that as a chance to destroy Konoha,and how is Orochimaru getting a redemption? Noones paying attention to him.
Whoever called you a genuis should be shot on sight.