So, in a way it is why the greatest dangers are not from foolish people who do foolish things or evil people who do evil things but from good people who persist in doing their foolish wrong things to preserve their beliefs that they are good, kind and competent. (Dr. Carol Tavris)
Dr. Carol Tavris, co-author of the newly released third edition of Mistakes Were Made (but Not by Me): ‘Why We Justify Foolish Beliefs, Bad Decisions, and Hurtful Acts.’
The book explores reasons good people remain wedded to foolish approaches.
I have not read the book but the above is exactly what I have learnt from reading many posts and tweets.