I think genuine SoPW answers should only be downvoted if they contain harmful advice - and then I usually prefer to reply with an explanation why it's bad advice.
There is nothing wrong with a good answer that has already been given. The wording of a reply can help clarify an already given anwer, and having multiple "identical" answers can indicate a consensus on how to solve the particular problem. I think it's a waste to downvote perfectly good answers - even if they add nothing to a thread. If anything, it's discouraging to the poster.
In reply to Re: In support of downvoting plagiarism
by Joost
in thread In support of downvoting plagiarism
by anonymized user 468275
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