That’s the crux of the issue I think and has been debated by political theorists and philosophers for centuries now. Tocqueville is the most prominent in my mind if I remember correctly. What is the point of a legal right to freedom of expression if private individuals can shout down each others’ expression through, in this case, subjective moral standards via tools such as social media.
Because government interference and individual people being upset are two very,
very different things.
You have the right to be heard. But so do I, even if my opinions are different than yours.
One of the original points argued here as to why WotC is not doing Dark Sun is for fear of public backlash. My argument, and that of others I believe, is that this is unhealthy for the industry and for creativity.
Or as I said, maybe they don't feel comfortable writing such a thing because... they don't feel comfortable doing it. As it is, you're basically assuming that the writers have no opinions of their own but are acting solely out of fear of The Masses.
I mentioned before, I co-created, and did most of the writing for, a setting that has slavery in it. I know what my table's limits are on such things. But I also know what
my limits are. I didn't include things in this setting that I would feel uncomfortable playing or running. The slavery in my setting has limits everyone at my table can deal with.
And again, WotC is not being censored or repressed or being forced to bow to the whims of the market. They're choosing not to revive a really old setting, just like they apparently have no desire to re-publish Birthright.
I'd go so far as to say that slavery probably isn't even the main reason they don't want to publish Dark Sun, just one of the reasons. It's the lack of a psionics system that's the main reason, since there's never been a consensus on how D&D should do psionics even after, what, three UA tests, and a
lot of people have said they don't just want just psionic archetypes in DS, they want a full system. But it sounds better to say "we don't want to do slavery" than it is to say "we have no idea how to do a psionic system that you guys won't hate."