Not sure that this is Scorsese’s intended interpretation ... Sheeran’s daughter realizes that he killed Hoffa *because* he didn’t call Hoffa’s wife i.e. because that means Hoffa is no longer a friend to him, but had become, in his mind, a hitman’s target, and is now categorized as just his latest victim. His daughter recognizes the killer’s mindset in her dad, and understands that he could, in principle, turn on his own family. At the end of the movie, when Sheeran asks himself « what kind of man makes a call like that » he’s not feeling guilty at all ... Otherwise, he would have asked himself : « what kind of man kills one of his best friends ». He’s merely pointing out that he didn’t cover up his crime adequately ... Killing a friend required more finesse than he was used to employ. In other words, Sheeran has no moral sense, in fact he never had one, as we can see from the flashback to the war, where he kills two soldiers. It seems to me that this movie is about the kind of person you need to be in order to work for the mafia. The movie shows you that. By extension, and especially through the various references to the politics of the time, the movie tells you that the war between nations is driven by the same kind of men Sheeran is, only on a grand-scale.