I respectfully disagree with you. His motives, once Itachi showed up again and reminded him why he was emo, have been selfish. The way he's acting right now, referring to Sakura and Kakashi like they don't matter, makes me think he's in it just for survival at this point, hence why he is trying to even keep Naruto alive at all. Let's not forget all the awful things Sasuke has done because he thought he was in the right and/or thought he was entitled to do so.
I want Sasuke to be awesome, but the direction his character is going (for me) is just down a darker path. He's confused and easily manipulated, but I do not believe his motives were solely because of his clan...he was thinking only about how HE felt which is pretty evident given how Naruto was trying to relate to him the entire time, yet he didn't care, because HE felt angry and someone needed to pay. He is selfish.