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Submicroscopic by S.P. Meek was published back in 1931. The main character is a human who falls into a sci-fi setting full of both humans and evil nonhumans. One of the nonhuman races has black skin, and has no intelligence, creativity, or mercy. They can copy devices and tools made by other people, but they can never independently develop something new. Their main motivation is to mindlessly kill and pillage, so they have to be killed first.
The other evil nonhumans have yellow skin. They’re scientific geniuses, but also merciless imperialists. They can be negotiated with to some extent, but they will never have empathy for human lives. They also need to be killed before they kill humans.
This is clearly an adventure story, and the author isn’t outright saying anything other than “fighting monsters is cool.” At the same time, it’s pretty dang clear what the author is using as a basis for his monsters, and readers who object to that are doing so for an understandable reason.
The other evil nonhumans have yellow skin. They’re scientific geniuses, but also merciless imperialists. They can be negotiated with to some extent, but they will never have empathy for human lives. They also need to be killed before they kill humans.
This is clearly an adventure story, and the author isn’t outright saying anything other than “fighting monsters is cool.” At the same time, it’s pretty dang clear what the author is using as a basis for his monsters, and readers who object to that are doing so for an understandable reason.