That's alright, hacker doesn't remember it, so I guess that means it never happened.

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I don't think the ban hammer absolves all preceding "sins". E.g. if a solid link can be established between the sockpuppets and it can be shown that he spam-bumped threads with multiple accounts, that should be viewed as a separate issue. However it would likely be a temporary ban anyway so the point of the OP is kinda moot.