No... Sasuke has no right to be like this, there's nothing that can say that HE of all people does. He's lost a lot, that's true, but he's got a lot to be thankful for, and he's just said the hell with it all. And why? Because he can't accept life, the way Naruto can, the way Naruto's mother could, the way everyone but him seems too. Hell even Oro did something better with his life after growing up with no parents. As much of a Villain as Oro' was, he didn't do anything due to anger, he was inspired by life to challenge death. Back on topic, Sasuke killed the last person from the Leaf truly responsible for what happened to him. The only person left is the very Shinobi he persists to side with; Madara Uchiha. Itachi sacrificed himself for his brother, so Sasuke would never have to suffer like this.. And Sasuke could've easily chosen not too, but he chose to throw away Itachi's sacrifice, all the friends in the world, and his chance to rebuild his Clan.