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I suggest you reconsider your position on fiction
I now believe that fiction could be useful because it conveys experience. For example, The Walking Dead, the Tv series I am watching at the moment, has a complex interplay characters, as it shows how humans interact in a plethora of situations.
Most people don't have that in mind when they bump into fiction. But, as I said, if you don't have enough experience, and you need a quick dose, sometimes fiction can help you.