A stretch:
I'm guessing that Vito, a generally shrewd judge of character, knew Carlo was worthless--note that even on Carlo's wedding day, he warned Tom never to discuss the family business with Carlo. If Vito knew that, he probably discouraged Connie from marrying him. When she married him anyway, Vito might have taken the attitude, "Well, she made her own bed--let her sleep in it."

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.