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No he "got away" with decades of war crimes by becoming disillusioned of the society he was born and bred in and becoming a political enemy of the state and putting his physical wellbeing at risk to free the people his country had waged war on all while mentoring the person who would take over that country and try to create a better country and a better world. One of the most poignant moments is when he says he didn't realize his visions of conquering ba sing se would be him taking it back for its own people.
The Mikhail Bakunin of Nickelodeon cartoons.
Which is why this is fictional, and he's allowed to have a narrative story arc.
However, if this was a Nazi SS Officer, who fled to South America, and then went on to redeem himself by [insert narratively compelling redemption story], he'd still be a war criminal.
But again, it's a cartoon, and we don't have to treat his character as if he were an actual Imperial General commanding troops during wars of conquest, especially one from the IJA.