It proves the point that locking threads to registered users only does nothing to improve the quality of posts, as we already know.
In fact locking threads does not prevent anyone from making inappropriate comments as has been shown by one registered user who obviously made an inappropriate comment to prove the fact and subsequently thanked the editors for deleting part of his comment as he only did it to prove the point.
Whether this thread gets hijacked or not, and whether this thread itself gets deleted altogether by the editors,the point is that the forum is a public debating place for many of us who may not get the opportunity to debate local issues and we don't like it being taken over like this. It may not be perfect but it is the best we have (or at least I don't know of a better one). Thanks to the editors for trying to get rid of PCM, but please don't lock threads to get rid of him as it does not work. It just stops the majority of us from being able to debate also.