This recent Mother Jones article is pretty illuminating as to how defense mechanisms kick in when cherished beliefs are threatened by new information. All the responses discussed--discrediting the source, denying the validity of the evidence, etc.--are, no surprise, exactly the strategy employed in WT publications discussing Biblical criticism, evolution and other contradictions to the WT worldview. What I found interesting was that such emotionally-driven responses feel like rational responses to the individual because the emotion to preserve belief systems kicks in before the analytic response. I'd like to show this to my husband, but I know he'll discredit it and point out all the ways it doesn't apply, thereby unwittingly providing support for the point being made. Except he won't see it that way.
http://motherjones.com/politics/2011/03/denial-science-chris-mooney