It's a group of people that Bertrand Russel describes as the "instinctive men" in "The Value of Philosophy." They only accept ideas that strengthen their own views and reject anything that goes against what they believe. As people get older, it seems, a lot of us become "instinctive" and are unwilling to accept new thoughts that go against our habitually defined beliefs. It takes a lot of effort to remind yourself that you may be wrong and to accept criticism from others.
However I believe both sides in this argument are acting dogmatically about their views, both sides are currently butting heads and neither seems willing to accept that this is currently working for the other group or that the other group isnt going to give in to their own views.
I think everyone needs to just back down and agree to disagree (even if you walk away thinking the other party is idiotic) as long as we all just step down and walk away, this isnt an argument that either side will win.