Semi-neutral, not completely neutral. It’s impossible to be 100% neutral in a story.
For example, the Merchant of Venice by Shakespeare is about anti-Semitism in Italy. Yet, Shakespeare held anti-Semitic beliefs. Most of his works (at least in a feminist perspective) portrayed women badly. The thing is, was it his personal beliefs or society’s beliefs at the time?
I say this because, when you’re completely biased it will lead to some kind of misrepresentation. Birth of a Nation, the film. Perfect example of the combo of society’s beliefs and the creator’s beliefs. It illustrated that black people were bad and that the KKK were “white saviors”.
Another example can be most of Tyler Perry’s films. They also portray black women badly. The reason for this is because he had trauma with a black woman (his mother I think) when he was young. Despite this, his films are extremely successful.
You mentioned the Narnia series. Great point. The series had religious motifs throughout all 7 books. In “The Lion, The Witch and The Wardrobe”, Jadis is the main villain. Why is this so? We don’t know. But again, interpret it through a feminist lens and it’ll make much more sense.
My last example will be majority of episode’s “famous” stories. They have white, able-bodied, female characters as the protagonists. Often, they are the quintessential American girl- Protestant Christian, sort of religious, either blonde or a brunette, feminine. And often, these kinds of stories are romance and drama. They have multiple YA fiction tropes in it and, again, misrepresent other cultures, religions and races, like blacks, Italians, Hispanics/Latinos, Muslims, Jews and more. When people call them out for it, do they stop and learn how to represent correctly? No. Because we keep seeing these kinds of stories all the time. It’s like a cycle. It’s systemic.
And where do they get these stereotypes from? Their society. The world around you influences your art. We see these stereotypes pushed onto us in the media and in literature.
To connect back to my thesis, being semi-neutral is the best option for being a writer since our world influences us the most. By “semi”, I mean 35 to about… 50% neutral. Of course we’re going to have political, racial, sexual, cultural… Any type of bias. It will always be there. But it’s up to us to learn how to not let it completely affect our work as writers.
(God, that was long. I hope it was informative enough and that I made sense. 
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