Itachi agreed to do as he was told, not knowing that his actions will push Sasuke towards vengeance, which later led to the death of Itachi. As a village shinobi, Itachi took the oath of allegiance, and his allegiance was to Konoha and not to his clan or family, which was why he mad...
Of course, FMA isn't the only series where this concept comes up. We all know about Sasuke Uchiha's quest to kill his brother Itachi for murdering their entire clan in Naruto. Sasuke only finds out the terrible circumstances behind his brother's actions after he's already killed him. Onc...