Generally, the arguments have been (a) the Fidelius Charm can't protect something intangible like "the identities of the Thorn Circle"; and (b) you can't make someone who can't understand the secret (e.g., an infant) a Secret-Keeper.
Which to me is another example of "Rowling didn't say it could work like that, but she didn't say it couldn't..."
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The Fidelius Charm
Date: 2011-09-03 01:08 pm (UTC)Which to me is another example of "Rowling didn't say it could work like that, but she didn't say it couldn't..."