[Tsuwabuki]

Children of Men is not even remotely in the same category. It's less about science fiction, and more about dystopian crumbling of society. It didn't have to be placed in the near future. It could have been placed in an alternate universe past.

If you want something very similar, I suggest you read Never Let Me Go by Kazuo Ishiguro (famous for writing The Remains of the Day), which also takes place in England. By far one of the most powerful "science fiction" books I have ever read.

Again, the problem is, I think you're limiting your view to very popular movies and TV shows, and not looking at the whole of science fiction, American or otherwise. The fact that you've chosen to ignore so many books by Feintuch, Weber, Moon, Drake, Ringo... Shows me that your real complaint is directed specifically at big budget studios and how they attempt to cater to the lowest common denominator for profit.

Again, I think trying to attribute this to America as if somehow America's whole science fiction scene is just what Hollywood puts out is unfair. And also ignores the same thing done by other countries.

I suggested Yamato, but it wasn't addressed. Aside from skin color, all the races in Yamato are basically human. Everyone speaks Japanese automatically. And aside from Gamilas's weird upside down buildings and seas of acid, the planets are pretty Earthlike. The military headquarters are apparently in Tokyo...

Another example might be Nightwatch and Daywatch, although not exactly science fiction, all the important characters (both the Daywatch and the Nightwatch, and those told of in the prophecies) exist in Russia, and everyone speaks Russian.

Harry Potter fits the literary definition of science fiction, and not fantasy, because the literary reference is any world that is somehow directly connected to ours but where the science or technology is actually different than we "know" it is. In Harry Potter, it's our world, but the "rules" are not what we think they are. Not all science fiction has to exist in the future. I bring up HP because you have the same issues, for the most part. Aside from Fleur speaking French, everyone pretty much speaks English. The greatest wizards and witches (Voldemort, Dumbledore, Harry, Hermione) of the past century are English. I think Grendiwald wasn't, and Victor Krum is Bulgarian. But Voldemort is the greatest villian, Dumbledore the greatest wizard, Harry the most famous young wizard, and Hermione is generally considered (according to the text) to be the smartest witch of her generation (including all the other witches of her age, at all the schools of witchcraft and wizardry, worldwide).

I don't think it is fair to attribute this to the United States. It just isn't unique. Every country wants to create media which is interesting to its citizens. That is the main demographic. Hollywood still makes the majority of its money from Americans, so we shouldn't be surprised when the culture it tends to draw heavily from and appeal to is American culture.

I just don't understand the criticism of what is a mirror on issues within the culture that produced the media. To quote Clerks, "some of us rational thinkers weren't looking to [insert SF title here] to give us a viable glimpse of the future." You'd be better served by studying academic journals in various subject areas if you want serious theories on what the future might hold, and I believe that. There are some excellent papers on xenobiology, planet formation, and sociological predictions of the way social media will lead to changes in national structure.

tl;dr

I am not sure why it surprises you, and I don't agree that it is an America only phenomenon.