Chapter 4, available to read here, goes into the same topic you mention above from a different angle.
"So convenient a thing it is to be a reasonable creature, since it enables one to find or make a reason for every thing one has a mind to do." ~ Ben Franklin
ETA: a good quote from the chapter that applies to the information in The Righteous Mind -
Loewenstein set out to find other ways to “de-bias” negotiators. He tried having subjects read a short essay about the kinds of self-serving biases that affect people in their situation to see whether subjects could correct for the biases. No dice. Although the subjects used the information to predict their opponent’s behavior more accurately, they did not change their own biases at all. As Epley and Dunning had found, people really are open to information that will predict the behavior of others, but they refuse to adjust their self-assessments.