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I don't know if he deserved it but he left Michael no choice.

You don’t break a mans heart.

I’m inclined to agree. Fredo was warned not to side against the family, not only did he betray that, he participated in a plot to kill his own brother and spray bullets at his wife and kids.

I know there’s ambiguity around the extent of Fredo’s involvement and he pleads partial ignorance, but can he even be trusted about that?

Some people suggest that banishment would have been sufficient. But how do you know his persistent bitterness and resentment of Michael’s success and status wouldn’t have caused him to turn traitor again, and maybe bribe some bodyguards to finish off Michael?

Killing Fredo was undeniably harsh, but what choice did Michael have?