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He does have the right to retract it. This is a public forum for discussion, in which each of us has the ability to contribute freely and the ability to edit those contributions. With that ability comes some rights and responsibilities, granted by the site's maintainers:
the right to change our words later
the responsibility to edit to make the store of knowledge greater
the right to freely express our opinions
the responsibility to share our opinions honestly
There are more of both rights and responsibilities. With each right comes a responsibility, and with each responsibility comes a right. Neither works without the other, here in PerlMonks as in meatspace.
You can't take away one without taking away the other. It's a good system.
None of that negates the right the site admins have to repost what has been edited out of existence. Nobody said the right to retract would guarantee that a retraction would be permanent and irrevocable. It's something one should be aware of here in PerlMonks, because it's a fact of life here.
CopyWrite Chad Perrin