Non-fiction: The Righteous Mind by Jonathan Haidt. Of all the books of the last ten years, I can't think of one that more transformed my understanding of (and compassion for) my fellow thinking, feeling, moralizing, tribal primates. https://righteousmind.com/
I can second The Righteous Mind. Currently almost done with it. Has given me many thing to think about.
However, I feel like the author sometimes falls into the same biases/flawed thought patterns he spends the book describing. Because of this, I'd rate it as very good instead of great.
Non-fiction: The Righteous Mind by Jonathan Haidt. Of all the books of the last ten years, I can't think of one that more transformed my understanding of (and compassion for) my fellow thinking, feeling, moralizing, tribal primates. https://righteousmind.com/