I think the notion that someone who has devoted so many years of his life to something has just all of the sudden "shut it down" and gone legit is rather "naive." There is that nice enough for ya?
I agree that what you are saying makes sense. I just don't live in the USA and don't have first-hand information about what happens there and everybody says DiFronzo accumulated so much money he theoretically could well retire from crime to live the rest of his life without any problem. But I don't think that's the case, I don't believe it's in his mentality (or in any other crime boss's mentality for that matter). Once a killer, always a killer.