This and "April Fool's Day" would make a great double feature to piss off someone.
Repo Man's major point would seem to be "fear of nuclear war". Yet, it treats its LA location as though it had already experienced a kind of economic fallout. Long shots of paved-over landscapes that double as nature for a group of Hardcore leftovers. Children whose very future seems so bleak that they often respond to the bizarre sci-fi occurrences in a non-chalant way.
Even with all that, the gallows humor works well with Robbie Muller's playful cinematography.