I disagree with your accessment deathkiss. By Fredo's own admission to Michael and to Ola on the phone after the incident he was unaware that any harm would have come to Michael.

And as for being disloyal and siding against the family, I beleive that he thought every decision that he made was in the best interest of the family. He adhered to the fact that Roth and Ola wanted to talk to Mike because negotiations were going poorly. He was duped basically in beleiving that because of his nature, his childlike goodwill and trustingness. Perhaps at best you could rationalize that Fredo in a way wanted to help both sides by his actions and feared that if negotiations couldn't be helped along Michale could have been hurt.

There is far more evidence to back up this point of view than one of malicious betrayal on the part of Fredo. I agree that he was foolhearted, but at the same time, Fredo did have a childlike simplicity to him and this would not be tohe best ideology to have in a game of men.