In the interest of keeping a neutral point of view I offer the following quote and suggest that you follow the link to read more:
In many ways, we do not act according to the truth. We act according to the truth as we believe it to be. And there is a particular danger when "experts" are certain that they know the truth. The human mind innately responds to "psychological certainty" by creating very real blindspots to evidence and arguments that contradict the certainty. Anyone aspiring to be objective in viewing evidence and sorting through arguments needs to develop a degree of self-doubt in order to minimize the automatic and natural actions of the human mind.
This is from: http://www.sourcetext.com/sourcebook/essays/scotoma.html