I guess it's fair to say that, but I don't think sci-fi should be primarily about delivering a message, i.e. that racism is bad or whatever. I think it should be primarily about coming up with some new idea, specifically of scientific/technological nature, and trying to write a story about it. There's room in there for black lebian writers and gay latino characters and all manner of progressivism, but once the point of your story is to deliver some message, it becomes the sort of thing that the Sad Puppies are complaining about. Obviously there are exceptions to this rule, for instance 1984, but I think those should stay the exception and not the norm. (and yes, I don't really find gender/racial politics very engaging at all, but that's personal preference)Sci-Fi is one of the most important places for gender/racial politics.