I think you're subtly contradicting yourself here. While humans have, for millennia, used fiction to enshrine and explain morality, I don't think a sensible cas

I think you're subtly contradicting yourself here. While humans have, for millennia, used fiction to enshrine and explain morality, I don't think a sensible case can be made for suggesting we use it to derive or define morality. Unless, as in the case of holy scriptures, one argues that adherents derive morality from that which has been enshrined in the fictional source. But still, the fiction itself enshrines the moral teachings, and readers derive whatever they do from it (and even then, inconsistently at best).