Star Wars's theme sounds more uplifting and hopeful, as well as reminding the audience of small rebel group vs big British speaking empire. It's also an ironic in-joke (as is "Space Invaders" only harder to justify and yet the use of the SW theme didn't entirely fail as a selection, especially as (a) it's an entertaining tune, and (b) the SW theme is a very long one and when used with Visitor after Visitor coming out of ships, it hit home very quickly how huge the implied alien army was.)
And, yeah, sci-fi or otherwise it makes sense that in "real life" someone would look at a then-popular movie -- Return of the Jedi was right around the bend, roughly 3 weeks away in fact. The use of the SW theme and the basic genre of sci-fi would be deemed sufficiently appropriate, though if the aliens really were aware of Earth culture and telecasts they should have seen episodes 4 and 5 and then wonder... but given how quickly V sets up the Visitors as being pretty much invincible and a claustrophobic threat, the Visitors could figure out any number of sci-fi shows and not be bothered. Comparing real life news to sci-fi would have the same effect.
If nothing else, the use of the theme reeks "product placement" - something the 1983 original didn't really have.
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