This question already has an answer here:
OK, so let me explain this question with an example.
I ask a really stupid question that's either duplicate or too broad or something else.
Someone answers my question, and the first line of the answer says that it's too broad / duplicate.
Many people vote to close the question. I understand that this question is useless and I decide to delete it.
ERROR: People have spent their time answering... so you can't delete this question.
So then I say okay, fair enough. Then 2 - 3 people downvote me, telling me that the question is useless. Now every time someone starts typing a question similar to mine, they see:
Questions That may already have your answer -
- The Stupid Question [DUPLICATE]
So then they check the question out, leave me a downvote, and go back.
This way I keep getting downvotes and unless someone leaves delete votes, there is no way I can stop getting downvotes!