Who was killed for personal reasons? All of his killings, except Frank Fiola and probably someone else who threatened him. He is no good, and he is ruthless I admit that. But Cosa Nostra is this - ruthless, and murderous.
Others might argue that being a successful mobster consists of other character traits. Fox AND a lion, my friend.
"Three can keep a secret..if two are dead." Calogero Minacore
