He wrote an RPG world.
He wrote a fictional tale, which nobody had read or been offended by.
Is the takeaway here that fiction can no longer be controversial, or have an unsavoury theme?
Struggling?
If that's your takeaway, then I would say that you have badly missed the point.
It's absolutely astonishing to me that people, still now, insist on so badly missing the point.
Or, put it another way, why is knowing the truth, as in the complete truth and not just the comfortable, selected truths, seen as a bad thing? Why is it when we learn about how this formerly lauded individual (regardless of who it is) actually was a real human being with flaws and views, it's suddenly a bad thing?
Look, it's pretty simple. If you don't want history to remember you as a dick, don't be a dick. We live in this vast sea of information now. Which means that all that stuff that was "conveniently forgotten" like, say, being a slave trader (as an example) is now readily available. And yes, new information results in people changing their views on the past. And it should. We should never look back on the history of someone or something, interpret it one way, and then, regardless of any new information that is later learned, insist that that single interpretation must be the only one we ever use for all time.
I know it's a big shift for a lot of people to learn that the "facts" they grew up with are no longer the only facts. It's hard to learn that people we thought of as heroes were in fact, really not. Good grief, I'm old enough to remember when Columbus was a hero. Now, we realize that he was much more of a murderous bastard who spend a significant time in Spanish prison for being TOO violent to the natives. How bad do you have to be for the 15th century Spanish to chuck you in jail for what are essentially human rights violations?
It is NEVER about "fiction can never be controversial".