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Danzou claims that if Itachi stood by the Uchiha's side both him and the entire clan would be annihilated. And we all know that Itachi get's a helping hand from Obito. Would Konoha even stand a chance against Obito, Itachi, and the rest of the Uchiha clan? I think that the Uchiha coup d'etat could have succeeded with less commotion so there wouldn't be a huge war with other nations involved.