Harry Potter and the Deathly Hallows discussion thread (SPOILERS)

[CallMeIshmael]

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Harry had an interest in keeping Pettigrew alive. He could clear Sirius Black's name.

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Just to nitpick, but I think that since Sirius himself wanted Pettigrew dead, it is probably safe to assume that Pettigrew dead or alive, Sirius is now safe.

All they need is the body to confirm their story.

I think the act of letting him go was just about Harry's desire to not make murderers of his dad's friends.