Not much of a revelation, just an observation, but how much of sci-fi pushes the ideal that Humanity's path forward is unification?
Star Trek is a major one, and many would state it was a progressive show, and it earnestly was.
It also stated that in its ideal future, there's a Federation of like-minded extraterrestrials, and as a member species, Humanity lives in a united, post-scarcity society under a single government.
To that end, how many alien species in these stories are so inhuman, in that they have no differences, a world-wide government, a single language?
It's laughable how direct the propaganda was, and continues to be.
Generally that is down to lazy writing, you see it in fantasy as well, all elves, all vulcans, all dwarves are all the same because it is easier to just write them that way. An in universe explanation would be that since the media is generally presented from a human centric perspective that they don't recognize the differences between say a high elf and a wood elf while it would be instantly recognizable to any elf those differences. Which is actually very realistic when you have one ethnicity looking at other cultural groups and not seeing the difference between similar subsets in those groups.
I disagree. I think they purposefully promote all "good" races as sharing the exact same core values: equality being the top value. This is obvious progressive programming and conditioning.
What's wrong with equality?
Everyone should be treated equally unless they have proven that they are not equal.