My problem is not that Sasuke wants a revolution, my problem is the way he's going about it. If he was so sure he was going about this the right way why wouldn't he just wake up everyone from IT and ask them if anyone is interested in joining his revolution? Killing the Kages while they are asleep is cowardly, they should have a right to defend themselves against his accusations.
Mei, Tsunade and Gaara are not responsible. Mei and Gaara are fairly new Hokages and both are trying to clean up the darkness of their villages. Tsunade, who never trusted Danzo or the elders was just starting to defy them when the Pain thing happened and then the war came.
He clearly stated he intends to kill Naruto. People in the alliance have come to like and respect Naruto. They realized he thought of the entire alliance as comrades and he did his best to protect them, no matter what village they came from. If he was so sure killing Naruto was the correct thing to do to start off his revolution why not let everyone see it? Because he knows they would not let him do it.
Why isn't he waking up everyone from IT? He has no idea how long it takes to turn from a person to a White Zetsu and yet he is taking chances with their lives by not waking them up. He doesn't care about them, he only cares about his own selfish wants and needs. He doesn't know for sure that he can wake up everyone without Naruto but he's willing to gamble with their lives to get his own way. That's not the sign of a leader.
After all that he has been through he has not learned a thing. He thinks he knows what's best for everyone just like Madara and Obito and also like them he thinks power is everything. All he he has done is transfer all of his hatred for Itachi to Naruto, the tailed beasts and the system.
He can't make up for killing Itachi by killing the Kages and Naruto, that won't get rid of the hate in his heart. Is everyone who gets in his way or disagrees with him going to be killed or put under genjutsu? You can't be a good leader if you could care less about the people you lead. You can't care about anyone else when you are full of anger and hatred.
Clearly things do need to change, but Sasuke has been around for maybe a few hours or 1 day of the war and he thinks he knows about everything that happened. Things have changed since the alliance was formed. He'd rather get right to the killing instead of releasing the IT and assessing whether or not many things have changed since he left the village and how the alliance might have affected the villages relationships to each other. I'd be more willing to give him the benefit of the doubt if his plans didn't start with killing people.