Personally, I find it ironic that in the 'information age' we have what seems to be a relapse in what one might call 'commom sense'.  I feel that there is some sociological tendency to reject what most would call 'obvious' in favor of a rather anamoulous set of beliefs simply to feel different.  The most striking quote is that one believer stated that their worldview made them 'feel special'.  That is really what this is about, being part of an exclusive club.  More power to them, I guess.  I don't believe it is anyones best interest to waste energy debating this, if there is even much of a debate to be had.  It is only an exercise in futility.  It becomes blatantly obvious at some point that irregardless of the fundamental science that has enabled deniers to reach this point, that unless the knowledge is relevant in daily life, it is largely irrelevant what anybody believes about anything anymore.