In Naruto Shippuden, why did Sasuke became evil? I understand that Sasuke learns Itachi was motivated by his desire to protect the village. Itachi only slaughtered his clan because they were plotting a rebellion. And thus Sasuke's motivation for killing Itachi was slightly misguided. Since Tobi told him about Itachi, why does he want to destroy Konoha? Itachi died protecting it so why does Sasuke wants to destroy it?
He wants to destroy the village that put his beloved brother in the position to choose between his family and his village.

Sasuke can legitimately be thinking that if given a command to kill all of your relatives, the people who gave that command are evil and should be destroyed.

Don't forget that when it comes to family, very strong feelings can easily be affecting Sasuke. 

Really, Itachi choosing the village over his family was the abnormal decision.