<p>I don't think there should be a general policy with regard to this issue.  I believe this decision should be solely the prerogative of the individual answerer.  That is, you should get to choose which of the options you prefer, and should be entitled to chose differently from one thread to another or even deleting / undeleting and editing the same answer over time.  </p>

<p>In this particular case, I think you are right that the answer is incorrect, but that the discussion in comments is illuminating and contributes to the thread.  In that sense, there is perhaps a net benefit to the site for it to remain.  However, I think that should be your choice and I personally would respect your choice even if you chose to delete it.  </p>
