Wow, are you being serious?
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Kakashi himself stated that he was victim of that era and was corrupted by Tobi/Madara.
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Itachi who was the one that initially changed Sasuke stated that his heart was a blank canvas, easily painted -- similar to how Nagato was. Naruto understands and can even relate with Sasuke's reasoning, going as far as saying he could have
easily been in his same shoes.
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One misstep and he might've been thinking the same horrible things.
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I'm not saying it's the right thing to do but he himself doesn't stand for what they made Itachi go through and by extension the ostracism of his clan which ultimately resulted in their destruction. In his eyes the village is unjust and cruel which is his main driving point in wanting to destroy it. They are all enjoying peace at the cost of everything that initially mattered to him. He also states that he yearns to "free" the Uchiha clan from this corrupt shinobi world and in sense he has valid reason in seeing it that way; corrupt.
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Onoki stated several interesting things; Shinobi are greedy, fight solely for themselves and fail to share other's feelings. The very same shinobi world that condemns Sasuke have sought and taken revenge themselves, it's all part of a cycle that has been ongoing for years.
He admits that the current ninja world's system is birthing hatred and voices out a desire to change this, as it's their own responsibilities to do so.
I'm not saying this all going to magically grant him a pardon but this along the truth about his clan and Itachi being revealed to everyone publicly might just assist his case. He's also been manipulated into being a pawn of Tobi, like Nagato before him and like Sunagakure with Orochimaru.
Yes, I know the circumstances are different with the Orochimaru situation but nevertheless similarities can still be drawn. Sunagakure didn't have to side with their Kazekage in wanting to invade Konohagakure, they could have fought this issue.
After all, Danzo and the Hiruzen's advisers overruled him and continued on to order the massacre of the Uchiha clan. They went against his wishes which validates that a village could very well disagree and take action themselves.