Why did I love this book?
This is the OG of books on polarization in modern US politics.
It’s a seminal take on partisan misunderstanding, arguing that Democrats and Republicans have different “moral foundations” or values, and that it’s often the case that neither side’s values are fundamentally better or worse, they’re just different.
Haidt compellingly describes himself as a formerly polarized liberal who grew more tolerant and even appreciative of conservatives when he came to understand them better due to his research.
Moral foundations theory is somewhat controversial now but there’s a lot of good evolutionary psychology in the book that clearly holds up well, like Haidt’s discussion of the “groupishness” of human nature and how “moral reasons are the tail wagged by the intuitive dog.”