I read sci-fi. The idea that you only "write what you are/know" is laughable. Sure, if you write a book with such offensive ideas about another culture or race, you're a terrible person. But if you research, interview, try to understand, and come at it for a work of fiction, that is what large swathes of fiction is!
I read books about spaceships, about robots, about humanity that's split off into different evolutionary groups.
I credit part of my immediate acceptance of LBGT+ and people on the sci-fi books I read as a kid, where changing your sex/gender was as simple as a 15 min visit to a shop (or similar), and the protagonists switched genders or sexs regularly. Hell, or some where neutral (in one case, they were neutral, because they used to be a warship, and the author used the female pronouns to describe all characters, even men! Great book series, by the way. Ancillary Justice was the first one).
Or with two characters fall in love, when they're not human, or not male and female or whatever.
One of my favorite authors (two of them, they're sisters, SK Dunstall) wrote some amazing male protagonists (and female ones). Not once while reading their linesman series did i ever stop and go "they shouldn't write about a male protagonist". Hell, at times their male protagonist was better written as a male protagonist than books I've read written by men!
There's a book on my reading list now, (to be taught, if fortunate) about humans genetically modified for specific environments, like space!
The discussions these books generate is important, in many cases. Some are meant to, others meant to just be enjoyed. Intent is important as is accurate research and characterization, when possible. Sure, if someone writes a book that's purposely harmful, or accidentally (but with a huge, disproportionate impact) harmful, then the book should be reviewed and maybe issues addressed to the author or by those who sell it. But only when its extremely harmful as a whole.
But the important thing is, these are all fiction. There's good fiction, bad fiction, and 90% of it is subjective. Fiction gives you the license to go beyond who you are, what you know, what ties you to the real world. And invites those discussions, invites people to learn more.