Mistakes Were Made (But Not by Me)

Did not finish the book. Picked it up because I wanted to increase my argumentation skills and diminish misunderstandings.

The author argues that we act in order to decrease our own cognitive dissonance (for example; I have given a gift to that person - i would not give gifts to people I dont like (this would create a dissonance) - therefore I must like this person (a strategy Benjamin Franklin used to get an political opponent to like him)). To diminish this cognitive dissonance we come up with all kinds of argumentation why we do what we do, or self-justification.
This is explained in the first chapters and the book continues on with loads of examples and how cognitive dissonance and self-justification manifests themselves.
I did not find the book interesting enough to continue after that.