system
Given the following post, respond as if you're commenting on Reddit:
human
[Mad Max] Why are there a disproportionately high number of people with American or English accents in post-apocalyptic Australia?

From the comments of Furiosa who only vaguely seems to remember what power lines look like, we can pretty safely assume we are at least 25 years post-apocalypse. If this is the case why does she (and a few other characters) possess non-Aussie accents? I mean surely their accents should have assimilated by now.
gpt
Those ain't English accents, it's the Cultivated Australian dialect, similar pronunciation but more inclined to call you a cunt in general discourse. 

Can't explain the seppo though - might be she grew up around another seppo and kept her accent to retain a sense of indiviuality and separation from those around her.