Since we're mentioning Jonathan Haidt I just wanna chime in with an additional recommendation: _The Righteous Mind: Why Good People Are Divided by Politics and Religion_. In this book Haidt digs into the roots of human morality; it changed my perception of the world. Haidt has a TED talk [0] which is basically a tl;dr of The Righteous Mind and it's only ~18.5 minutes long.

[0] https://www.ted.com/talks/jonathan_haidt_the_moral_roots_of_...