In the Mafia, a "good" husband is one who has only one or two goumads, and doesn't either beat his wife or infect her with STD's. By that measure, Sonny was a "good" husband. Carlo was an adulterer, a wife beater and a traitor. Also (according to the novel) a poor earner--the major Mafia offense.
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.