The right thing to do was to contact the BSD developer and let HIM go public asking people to remove the old version with incorrect copyrights and start using the new version where the copyright issues had been resolved, along with an explanation.
As Our Editor says, clearly this was handled badly by all concerned. This kind of thing is exactly why the FSF always starts with private conversations whenever a GPL violation is discovered: you can get so much more accomplished so much more rapidly if you don't make the other person feel like they're being attacked.
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