One of the responses to my discussion just disappeared! I wonder why this happen

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I had started a discussion, "Is it considered okay to marry within one's family?". There were 22 responses to it the day before. Today when I login there's just 21. I wonder why this happened. I think everybody has their own views and it must be respected. Just deleting it out is not okay. I am sorry for the user and regret not being able to recollect who it was.