because he found out that the hokage told uchiha itachi to kill his clan because the hokage thought that the uchiha clan wanted the power of the nine-tails and use it against him and one of the uchihas will become hokage.when a guy from that evil group told him or i cant remember if it was itachi that told him.
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Sauske wants to destroy the leaf village because danzo and the higher ups blamed the uchiha for the nine tails fox incident, because the uchiha eyes are the only ones that can control the nine tails. Madara was behind it all but they blamed the clan. The third hokage pleaded with them to spare the uchiha but they would not listen. So they ordered itachi to kill his brotheren so a civil war doesn't explode within the village. Itachi loved the village so much he killed all of his family, but he couldnt kill his little brother sauske.
So sauske wanted revenge of his older brother so he plans on killing danzo and the whole hidden leaf.
maybe because he say that revenge is not everything or he couldn't defeat naruto at all.
He doesn't come back. He gone crazy and now wants to destroy the village for some random reasons and joined the Akatsuki.
No, till now in manga in chapter 496 sasuke has got even more evil and plans to destroy naruto and leaf village.
Konoha or Konohagakure ( hidden leaf village).
as i think, yes. because if he revolves against konoha, and fights naruto, narutos special powers, especially, that given by itachi, will activate and stop sauske to go against konoha.
sasuke seeks power after his clan is killed by his brother he joins orchimaru but kills him after he tries to take his body he finally face itachi and kills him using the karin in the process taking and mastering the mangekyo sharingan finally joing the askaski meeting with Tobi and capture killer bee finds out the truth on why itathi done it and goes to destroy the leaf village