Fredo taking sides against the family would have affirmed Vito in his decision to pass him over in favor of Michael
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. Personally I never saw it as Fredo taking sides Against the Family. I think it was more of Fredo just being stupid. Even in GF 2 I genuinely believe that Fredo believed that he was helping the Corleone Family while also doing it “on his own”. Obviously we know it was stupid but I think in Fredo’s mind he thought he was doing something good
