++ great node!

"Attempting to rewrite history, e.g. the author requests the delete because it was a mistake *or* deliberately obscures/removes the original content."

This is one of my personal gripes :) A lot can be learnt from a wrong response and an update as to what was wrong and why should be all that is needed. I don't see another way to discourage this kind of behaviour so I tend to just vote to "keep" them, though if I am feeling particularly grumpy I might down vote as well -especially if the content has been removed :)

--
Until you've lost your reputation, you never realize what a burden it was or what freedom really is. -Margaret Mitchell