Consider this SO question: Why is !true ? 'false' : 'true' returning 'true'?, even though the OP hasn't accepted a "correct" answer, most of the answers here are (pretty much) correct.
We get a new SO user who decides to answer the question anyways (granted he cannot see deleted answers) hopefully to get points.
How can we prevent redundant answers to be posted to a "simple" question? This would be especially useful to questions that are old and gets answered years later.
If there is a similar question, just feel free to close this.