itachi had a horrible plan and all he really did was turn sasuke into a monster.
he brutally tortured sasuke and made him watch his parents being cut up over and over, manipulated him into living a life of misery, torment, hate and revenge, and even planned to brainwash and enslave him to be konohas puppet because sasuke didnt turn out the way he wanted. what the fuck did you expect, dumbass? of course sasuke lost his mind especially after the second torture session put him in a damn coma.
Sasuke was meant to be a hero, not a criminal
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if that were so, itachi wouldnt have mindraped him and told him to hate and live in despair and revenge. revenge only leads to more revenge. itachi of all people should have known that. after all itachis true plan was brainwashing sasuke against his will and FORCING him to be a hero so whatever he did to make konoha think he was a hero, sauske had no choice and would have lost his free will anyway.