I too reckon Carmela was as bad, condoning their murderous actions
Connie and Kay
Why did they make them so different from the novel?
They were made miserable, bitter and twisted in the movie whereas in the novel Connie apologized to Michael for her outburst about Carlo and Kay had accepted that he was a Mob Boss even that he was always fair
and they all lived happily for a hundred years!
Fredo too was made so different from the novel from the loving, obedient, dutiful son and Puzo wanted everyone here to know -- there's not gonna be no trouble from Fredo!
Sure thing The women were culpable too
They
knew what their husbands' business was
knew their rich, privileged life was funded by tainted money from other people's murder, misery and blood
Kay enjoyed the spoils of the blood money for more than 7 odd years until her bedroom was machine gun sprayed when it suddenly dawned! on her, this unholy and evil Sicilian thing that's been going on for 2,000 years must all end