Behavioral economics is not economics. Behavioral economics is possibly the antithesis of economics. This book is basically the argument "you do things that don't make economic sense because you're an idiot." Other books are basically the argument "economics doesn't make sense because we have emotions."
Kahneman will make an argument about framing effect by saying that in a study where people are primed with pictures of dollar bills they answer survey questions with less empathy, therefore people are stupid. Ariely will make an argument about framing effect by pointing out that you think nothing of spending $2000 on leather seats when you buy a new car because you're already buying a new car, but quake at the thought of spending $2000 on a leather sofa that you will likely sit in more often because the sofa isn't part of a $30,000 car purchase.