Robyn Dawes defines irrationality as adhering to beliefs that are inherently self-contradictory, not just incorrect, self-defeating, or the basis of poor decisions. Such beliefs are unfortunately common. This book demonstrates how such irrationality results from ignoring obvious comparisons, while instead falling into associational and story-based thinking. Strong emotion―or even insanity―is one reason for making automatic associations without comparison, but as the author demonstrates, a lot of everyday judgment, unsupported professional claims, and even social policy is based on the same kind of "everyday" irrationality.
The author wishes us to oppose irrationality, the adherence to beliefs that ar inherently self-contradictory, rather than acquiesce to it. Many real world examples of the cost of irrationality in public policy. A very dry book (even in the "good stories" section), but the section on "probabilistic irrationality" was of most interest to me.