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.