Alrighty... I haven't read Rowlings new story, which is the cause of all this, but I have to agree with the notion that this whole thing is a bit of a storm in a Tumblr teapot.
I am not going to say that none of those tweeters are Navaho, or of any other Native American nation, but in my experience, most of them probably aren't.
I've seen this before, in what became called "Kimono-gate". There a small group of young people screamed "cultural appropriation" when an art museum offered museum guests to put on a Japanese kimono and pose for a camera, in front of a Monet painting. It was an exhibition of Monet paintings, and the kimono was a replica of the kimono in the painting. These same youngsters, (as I recall, white, hispanic and one Chinese-American) then actually argued with a group of Japanese-American women, who showed up in authentic kimono. The Japanese-American women, some of whom were born in Japan and raised by Japanese parents in America, and many other Japanese-Americans were thrilled that the museum had come up with this idea (an idea that had been extremely well received at the sister museum in Japan), and were excited to share a part of their history and culture with the world, even though it was via a French impressionist painter.
And these protesters argued with the Japanese-American women, and told them they should be offended.
The end result was that the museum buckled and only displayed the kimono, instead of letting people try it on, and imitate a French impressionist painting.
Now, from my own point of view, as Bronx has said more than once...
There is no outrage when Marvel appropriates one of my ancient gods, and turns him into a blond, pantyhose wearing pansy. My people just think that's funny, and we know our Thor could take that Thor any day in a fight, blind drunk, with a blindfold and one leg tied behind his back.
We don't go crazy and cry appropriation when Spanish people, or Americans, or Australians don horned helmets and cry "We're Viking". We just giggle and roll our eyes and remind ourselves, "Vikings didn't put horns on their heads." And then we sell the damned things to the tourists, because... wait for it... that's what tourists expect!
I do believe that, yes, as writers, as people in general, we should respect other peoples beliefs, and cultural heritage, but that does not mean that we should avoid writing about anything but our "own heritage". My writing would be horrendously boring if I did.
A good example of this very argument, which I have not seen anyone go up in arms about is Neil Gaiman's "American Gods".
That is fantasy, and dear gods, how many religions and cultural heritages does Gaiman "appropriate" for that one book? It's an awesome book, and I actually found myself looking up some of the things that he wrote about, so I could learn about the very myths and gods that he was writing about.
And also, since it was mentioned, whenever I pick up a book written in English, I always, without exception assume that the writer is a white American, unless the name is obviously Japanese, or Spanish, or Russian or Polish. Which is why I usually start by reading the back of the book to see if I can figure out where the writer is from. It is not because I am a white American. It is simply because I am as white as they come Scandinavian, but my country has been quite "American-ized". So, it has become an automatic reaction to seeing an English "white-sounding" name, to assume the person is white American.
I know that I am not anywhere near as eloquent as Bronx, and Chrissy, and I don't have any real argument like they do but I whole heartedly agree with them. Especially with Chrissy, on this part:
Fear of reprisal doesn't breed respect or understanding-- it enforces white washing. Fear also breeds more racism. Then you end up with the Oscars (why not have more non-white writers? because they can't find jobs outside of writing about non-white people thanks to the problem created by your argument). People being afraid of writing something because of the backlash they might receive is the opposite of progress. When no one attempts to engage with cultures outside of their own it props up racism because it promotes Othering and exoticism that leads to fetishizing.
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As a writer, I could not agree with this more. If I only wrote about my culture I would be the most boring writer in history, and we honestly don't need that many stories about flea bitten vikings, eating sheep and going on raids. Or about depressed detectives solving murders, and having bad relationships with their pregnant, junkie daughters. The market is limited, in that respect, really.
So, that's my two very lousy cents.
Diversity is necessary in writing. We just have to do it respectfully and do our research before we write. And as readers, we must remember that, unless it is an official auto-biography, or biography, it is all fiction, and much of fiction is fantasy.