According to the law, you're a criminal if you kill someone. No matter what happened before or whether it was for vengeance. Murderers are criminals, that is what the law says and it's also pure logic.
Maffiosi are also murderers, and thus criminals.
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See, we can act as smart as we want, but at the end of the day, we still follow a guy who fucks himself with kebab skewers.