Michael would never have whacked Fredo during Vito's lifetime, just as he didn't as long as his mother was alive.
But, you're right: the rant sealed Fredo's fate. With all that resentment bubbling to the surface--AFTER Fredo's betrayal had nearly cost him and Kay their lives--there was no way Michael could let him live..
Ntra la porta tua lu sangu � sparsu, E nun me mporta si ce muoru accisu... E s'iddu muoru e vaju mparadisu Si nun ce truovo a ttia, mancu ce trasu.
