The Uchihas were plotting a.. what was the word again.. a coup d'état. Madara told me about it and I spoke to Itachi too, he was brought back using that edo tensei technique I told you about the other day.

He killed everyone 'cause he was ordered too. Except for Sasuke. Sasuke knew too, after he'd killed Itachi, that's why in his future he's so determined to get revenge on Konoha. Because of what they made Itachi do.