Let's face it: Vito was a piece of crap. He flaunted society's laws and peole's wellbeing to get what he wanted. He showed disgust at the prospect that Woltz was having a sexual relationship with a 12 year old girl, but I bet that there were members of his family or people under his family's protection who dealt in child pornogaphy. Don't forget what he told Sollozzo: "It makes no difference to me what a man does for a living.."