When a question has been closed as a duplicate, can we alert the author and ask 'Is this really what you're asking for?'
Then, if the author clicks Yes, auto delete the duplicate post?
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-1 Automatic deletion is seldom a good idea. Also, duplicates are often differently stated, sometimes with a complete different wording then the original question. This opens up the possibility to find the answer to the same question on different ways and prevents that a duplicate gets asked over and over again, just because the wording is different.