I would highly recommend "The Righteous Mind: Why Good People are Divided by Politics and Religion" by Jonathan Haidt. He's a left leaning psychologist, and it's basically a PHD level dive into how morality works at a psychological level, with quite a few dips into cultural anthropology. Once I understood how my own moral systems worked and how very different moral systems function, it helped me avoid these pitfalls of negative emotion blocking my empathy and understanding of other people.