Now Chris Mooney (author of the Republican War on Science) explains how this age-old human flaw is being analyzed in scientific detail, by researchers who reveal it to be dismayingly intractable. It seems that obstinacy is as deeply rooted as love or sex! See Moooney's article: The Science of Why We don't Believe Science:
Given the power of our prior beliefs to skew how we respond to new information, one thing is becoming clear: If you want someone to accept new evidence, make sure to present it to them in a context that doesn't trigger a defensive, emotional reaction.
Of course, there's hope, or we would never have climbed so far. In the last few centuries w discovered a general way around this dilemma. It is through the enlightenment process that underlies almost everything successful about our civilization - not only science but also free markets, justice and democracy. The one tool that has ever allowed humans to penetrate the veil of their own talented delusions. (See my review of Chris Mooney's Book on my website.)
We may not be able to spot our own mistakes and delusions, but others will gladly point them out for us! Moreover, this favor is one that your FOES will happily do for you! (How nice of them.) And, in return, you will eagerly return the favor.
In our enlightenment - and especially in science - this process is tuned to maximize truth-output and minimize blood-on-the-floor. But it requires some maturity. Some willingness to let the process play out. Willingness to negotiate. Calmness and even humor.
It doesn't work amid rage or "culture war." Which is precisely why culture war is being pushed on us. By those who want the enlightenment to fail.
Which brings us back to Mooney's cogent and detailed article, which explains the problem of "narrowcasting" to specifically biased audience groups, who get to wallow in endless reinforcement of their pre-existing views, avoiding the discomfort of cognitive dissonance from things like evidence...
... a problem - exacerbated by the internet age - that I predicted in my 1989 novel EARTH - describing a near future in which people shift their attention only to those sources that confirm and reinforce their pre-existing beliefs. (A forecast I would rather not have seen come true.)
* How ironic then, that the Platonists ( including his successors at "logic-incantation," like Hegel, Marx and Rand) have excelled even the priests at weaving subjective spells to mask the real world. Oh we are good at this. Delusion truly is the greatest human talent! Indeed, all you sci fi fans... what talent of YOURS am I paid to cater-to? Hm? ;-)