So many stories about blackmail and other kinds of extortion make you wonder why the person doesn't do "counter-blackmail," especially when money is being extorted for something other than a CRIME. So I wonder the same thing. In fact, I can't help wondering it about Vittorio himself - it seems like he could have said to Paul, "Stop extorting money from me and the others, and I won't tell anyone that you've been doing it."
Of course, then there would be no story.