We know from Fredo's "why didn't we ever spend time like this before" comment that Michael spent precious little time with him. This remark, in my mind, was Fredo's way of saying "this is all I ever needed from you".
I agree. Even in GF Michael didn't bother to explain or even tell his plan to Fredo, [i]especially[/] because he knew how weak Fredo was. No wonder Fredo got confused and perhaps his freaking out in front of Moe Greene was more dangerous than Sonny's behaviour in front of Sollozzo.
Michael should have known how much frustration had been seeded in Fredo's heart.
