The more formulaic the movie, the more it becomes a vehicle for the novelty of its premise, precisely because the familiarity and shallowness of a formulaic film serve to focus your attention on the symbolism that distinguishes it from other formulaic movies. In this case it's destructive aliens, massive walls (albeit of limited effectiveness), heavy manufacturing, and nuclear apocalypse (for the bad guys). The actual plot of a movie is often a sideshow to the iconography the producers wish to put on display, and reflections of a film's ideological environment are often unintentional.

It's kinda like the way all zombie movies explore a basically similar political question about the relationship between small groups of resourceful individuals vs a hostile unthinking mob that threatens their survival.

Re capitalism, don't you think people have heard that argument already many times and that many of them have decided it's not going to work out that way? It's not lack of awareness that things are materially far better than under the alternatives, it's the disillusionment that sets in at the lack of a credible alternative. You're essentially arguing that people should forget the odds and play the game as if they didn't know them, which is absurd.