I accidentally downvoted a question (misclick, drank lots of coffee heh...) and then upvoted the same answer. I noticed I was award the critic badge for giving my first downvote.
1 Answer
Why is it wrong? You indeed cast a downvote.
Whether you revoke it later or not isn't relevant, it was indeed cast for at least a few minutes (that's how long the badge process takes to run).
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I guess this is a badge that's not "wow a big accomplishment" but rather to encourage exploring the system. You did explore the system, even if unintentionally.– poolieCommented Sep 20, 2011 at 22:27