The story of the Italian vampires suggests that some vampires take on a veneer of civility, but continue to feed on humans. They may look like they are good, but they lack Carlisle’s self-restraint. Carlisle’s desire not to steal anyone else’s life when creating a companion again makes clear the Cullen’s view that human life is better or at least comparably different from vampire life, and therefore not to be forcibly taken. It's significant that when Carlisle was looking for a companion, he chose to first create a son or a platonic peer for himself (rather than a romantic partner). The novel reiterates here that family can take all sorts of different forms and still be legitimate. Edward’s story of his rebellious adolescence makes clear the danger he poses, but also emphasizes the transition he has made—he has grown as a moral being by restraining his adolescent vampiric instincts.