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harry potter - Why wasn't Peter Pettigrew bound with an Unbreakable Vow?


Peter was the secret-keeper for the Potters, so wouldn't it make sense to bind him with an Unbreakable Vow so that he could not reveal it? Is there any canonical information regarding this?



Answer



In order to answer this question, we need to understand what a Fidelius Charm is and what an Unbreakable Vow is.


Flitwick explains in PoA that the Fidelius Charm is



‘An immensely complex spell,’ he said squeakily, ‘involving the magical concealment of a secret inside a single, living soul. The information is hidden inside the chosen person, or Secret-Keeper, and is henceforth impossible to find – unless, of course, the Secret-Keeper chooses to divulge it. As long as the Secret-Keeper refused to speak, You-Know-Who could search the village where Lily and James were staying for years and never find them, not even if he had his nose pressed against their sitting-room window!’




What about an Unbreakable Vow?



“An Unbreakable Vow?” said Ron, looking stunned. “Nah, he can’t have. . . . Are you sure?”


“Yes, I’m sure,” said Harry. “Why, what does it mean?”


“Well, you can’t break an Unbreakable Vow. . . .”


“I’d worked that much out for myself, funnily enough. What happens if you break it, then?”


“You die,” said Ron simply.



Note that in both cases Peter Pettigrew could have divulged the secret. The only difference is that in the second case he would have died.


Now, think about it. Assume that Pettigrew, while bounded by an Unbreakable Vow, tells Voldemort about the secret (we don't know if Imperiused people can be forced to break a Vow, but maybe Voldemort could have convinced Pettigrew that he was such a powerful wizard that he could have undone the Vow). He dies, but Voldemort can still kill Lily, James, and Harry.



As you can see, an Unbreakable Vow offers no advantage with respect to a "simple" Fidelius Charm, except the death of the traitor, which is not only morally dubious when dealing with a friend - remember that James wouldn't have killed Pettigrew, as Harry says in PoA, and that James considered it essential to trust his friends - but also "useless," in that it doesn't prevent other deaths.


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