I really can't picture Sonny passing through that toll station without getting killed. Also Connie's reaction toward the matter that is shown in the third part is interesting. Sure enough she'd known that Mike ordered to death of Fredo. After all she was smart enough to figure who ordered to death of Carlo and others. She seems to understand how things work out in Cosa Nostra. Killing Fredo does not seem right in our everyday life but it is justified in Mafia. I can't blame Michael for that.