Fredo's "psycho boss"? Fredo worried about another beating? THAT'S the problem with Fredo!! How could he disgrace the Corleone's, a legitimate power to be reckoned with, by letting himself get slapped around by a nobody like Moe Greene?!! Just another reason for Michael to be pissed at him. If Fredo really had the interests of the family at heart, he wouldn't have been a drunken philanderer that NEEDED slapping around.

Puh-leeze!! Poor, weak Fredo. If I was Michael, I would've wanted to wring his scrawny neck. The fact that Michael tolerated his behavior as long as he did just showed how much slack Michael cut him BECAUSE he was his brother.