Board Thread:Naruto Discussions/@comment-5085906-20170813091843/@comment-734582-20170814055820

Mr. Grave wrote: Then all that followed by Sasuke completely missing the point and suddenly adoring his older brother even THOUGH his brother still killed his clan. That did not change. It just seemed stupid to me. Sasuke had always cared deeply for Itachi. Even in Part 1, Itachi was his whole world. He lived to kill Itachi. Except he never really killed Itachi directly. Then Obito told him half-truths, which made the Uchiha (pride of Konoha) the buttmonkey of a bad joke. It's clear that the Uchiha clan are extremely prideful, hence why Sasuke took that so badly.

Furthermore, Sasuke's original mission only kept expanding. He killed Itachi to avenge the clan, but because Itachi died willingly, to avenge the clan he needs to kill those that gave that mission and ultimately, those who did nothing to stop it.

Sasuke never really stopped being that murder-intent kid from Part 1, as Orochimaru and Obito prevented Sasuke's natural healing from his mental scars. Every time there was progress, there was meddling.