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.
I don’t think it’s just sci-fi related but rather space related. It seems that going to space just makes people want unity. All the NASA guys and astronauts seemed to have that perspective during Apollo and all that and I guess the sci-fi writers just took it and ran with it.
Going to space probably rekindles the frontier mentality that makes you want to work together to ensure survival.