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Why Is Madara Evil?
After the death of his brother, Izuna, Madara became cynical and vengeful and held a grudge against the Senju Clan for slaughtering his brothers in the War. After his defection from Konoha, he believed there is no real peace.
Why madara become evil
Many
Uhiha madara kill his brother
Itachi
Why Madara Is The True Hero Of Naruto
Summary If you really think about it,