Is it right for moderators to answer a question and locking other answers to the same question?
I think this act is immoral and a sign that the moderator should have their moderator status revoked.
Clarification: By locked I mean locked and not closed.
Example: Questions on meta.stackoverflow.com tagged as discussion, such as this one, one user answers: "Yes, it is immoral". A moderator comments on the answer and argues that it is not immoral, but cannot back up his comments. Moderator then answers: "No, it is not immoral", and locks the other users answer, thus effectively killing the discussion.
Real world example: Is the language “BrainF_ck” offensive?