Sasuke Uchiha made many mistakes throughout Naruto. In his search for revenge, he opted to do anything that would give him more power. Sasuke walked down the road of darkness and became a villain in many ways.
Despite that, by the end of Naruto Sasuke was ready to atone for all of his wrongdoings and was willing to sacrifice his life for the sake of the Leaf Village. One way he atoned was refusing the medical process that could restore his arm. He decided to let his physical loss remain as a reminder of his failures.
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