David McRaney wrote You are Now Less Dumb: How to Conquer Mob mentality, how to buy happiness, and all the other ways to outsmart yourself in Aug. 2014, but it is inexpensive to purchase. He addresses self-delusion using results from many fields, including philosophy (logical fallacies) and brain science (biases and heuristics). His tone is not so much holier-than-thou, with less "We are smarter than all those other stupid people who don't believe what we believe." He thinks we all make mistakes and can learn together to think better.