Fair, I'll concede the point at least partially. If I'm not mistaken, you need to be logged in to view anything from the Reputation section. I don't believe google searches discover posts from the reputation board, but I could be wrong about that. That doesn't help against threads elsewhere though.
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The Google issue can be mitigated to some extent by making the feedback pages non-indexable. So if someone merely googles your nick they won't see the derogatory info pop up directly in search results. They could still click through and see it but even today they could create an account and see it. Bigger fatter warning next to untrusted feedback could help. Perhaps don't show untrusted feedback to guests at all.
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I don't see how this would be necessarily worse than fake accusation threads such as " is a pedo / pill abuser / etc". Those are already indexed by search engines and tend to show up first.
This is kind of what I was talking about. Any user who has been here for a week knows that there are users with feedback about them being pedos/pill abusers/ etc, and I dare to say that 99.9% of that feedback is false. Thats not to say that someone on Bitcointalk couldn't be fired or not hired in the first place because of claims like that. But I suppose if the information is out their regardless, allowing guests a consolidated place to view all claims probably isn't worse than having to scour the board looking for them.