One thing that always gets me whenever I re-read the war arc is how Sasuke doesn't actually believe what happened to his clan until he hears Hiruzen say it.
Sasuke hears more or less the same thing from Obito, Danzo, Kabuto and Itachi himself. Granted, all of the others had their own agenda, but each acknowledged the same thing: That Itachi was a double agent and that he wanted to protect Konoha and his brother.
But of all of them, the person he trusts most to be honest with him is Hiruzen. The only Hokage he really knew, and the one he mourned for when he died. And he is visibly disappointed by the news, which suggests that in spite of everything, a part of him was hoping it wasn't true. The lingering hope says something about how much Sasuke loved his village and the people in it, and how much he loves them still that he continues to fight for it after that moment.