There’s something very different between reading a textbook account of events and reading a narrative where you connect with to a character’s thoughts. You may learn similar sets of facts, but the textbook account doesn’t alter your empathy very much, if at all. Stepping into someone’s head and living out that same history has the potential to radically alter your view of the world, often toward greater empathy, knowledge and understanding.
When it comes to narratives about people, the task of teaching tolerance becomes much simpler, and much more a matter simply of choosing to read. Broadly and deeply. Richly and widely.