When I saw the question this morning I considered whether it needed further scoping and my judgement call was that it did not. The issue is not one for which significant divisions exist in Christianity. The issue of the physical scope of the flood is perhaps a dividing line, but that isn't really relevant to "why" question either way. I couldn't think of any obvious way to focus the question without leaving the essence behind and there didn't seem to be any need to broaden it into an overview question: that's already basically what it was.
The problem with "truth" questions is that we are not the place to decide right or wrong on matters which even "Christian" groups haven't settled among themselves. This question on the other hand is fairly easily addressed from Biblical and mainstream Christian teachings in a broad fashion.