Again, noone is stating how.

I don't think that exile would have been enough, only because of the outburst in the boathouse. As Turnbull said, the boathouse scene confirmed that not only did Fredo know, but he also had resentment over being "passed over". IMO the resentment is what did him in, not the act of treachery in and of itself, because the resentment showed that he would never be happy.

Let's see that he's exiled and cut off from all the family business. Nobody directly in the Family deals with him. He's given some "Mickey Mouse nightclub" to manage to earn a living, and told pretty much to never contact anyone, least of all Michael. Who's to say that some other conniving gangster wouldn't approach Fredo down the road with another deal and promise him something of his own? Who's to say he wouldn't take that offer, either growing the balls to try and off Michael himself (not likely, but still), or snitching to the police, or giving any information at all that could be of some possible use against Michael and the Corleone Family, even if it's outdated.

Fredo HAD to die, because he showed that he would never be happy unless he was the Don, and that meant he could always face the temptation of yet another betrayal because he would always resent the fact that his "kid brother" was made head of the Family.

I don't think that exile would have been enough, only because of the outburst in the boathouse. As Turnbull said, the boathouse scene confirmed that not only did Fredo know, but he also had resentment over being "passed over". IMO the resentment is what did him in, not the act of treachery in and of itself, because the resentment showed that he would never be happy.

Let's see that he's exiled and cut off from all the family business. Nobody directly in the Family deals with him. He's given some "Mickey Mouse nightclub" to manage to earn a living, and told pretty much to never contact anyone, least of all Michael. Who's to say that some other conniving gangster wouldn't approach Fredo down the road with another deal and promise him something of his own? Who's to say he wouldn't take that offer, either growing the balls to try and off Michael himself (not likely, but still), or snitching to the police, or giving any information at all that could be of some possible use against Michael and the Corleone Family, even if it's outdated.

Fredo HAD to die, because he showed that he would never be happy unless he was the Don, and that meant he could always face the temptation of yet another betrayal because he would always resent the fact that his "kid brother" was made head of the Family.

I thought one of the most brilliant touches in II was how FFC and Puzo turned around Fredo's character. He was the stupe of stupes in GF, and started out that way in II. And yet he had enough balls to act out his resentment of his brother by selling out to Roth. And enough cunning to set up the Tahoe hit--and enough initiative to know that Pentangeli was alive and that Questadt belonged to Roth--long before Michael and Tom knew it. That made him a most dangerous character, IMO.

I never saw any evidence that Fredo set up the Tahoe compound assassination attempt on Michael.

Good question would be who left the curtains open to Michael's bedroom?

Other than Michael's sheer desire for revenge, the only possible motive I see that justifies what he did to Fredo was to put out the perception to the world that if you mess with Michael you sleep with the fishes.

I think the ideal solution for the Fredo problem would have been commitment to a mental institution. Easy for someone like Michael to arrange in 1960.

Lots has been written about Michael killing Fredo, but I have not seen much about what alternatives he had. If you were in Michael's shoes and learned that Fredo had betrayed you to Hyman Roth, withheld information about the whereabouts of Pentangeli and Questadt, and more likely than not had an idea it was going to be a hit, what would you do short of wacking him?

While we don't know who could have gotten into Mike's bedroom through all of the security inside the house, we do know of one person who definitely was in the bedroom - Anthony. I believe that when Frankie gave him that $100, he could have asked him to open the drapes to Mike's bedroom when he goes in.

In addition, why would Frankie trust a 7-8 year old boy?