Just as how not everyone who writes about sluts is one, or everyone who writes about conservatives is one, not everyone who places stories in Australia (or the U.S.A.) is from there.
Wait a couple months, and either way the election turns out, we may have a few more ex-pat authors writing about new exotic locales.
Despite my pen name, I've only set one series of stories in Oz: Swimming with Kate, and other than Bondi Beach and Bondi Baths, there's no specific identifiable Australian location in the story. (Yeah, they've got a beach cottage somewhere up the coast from Sydney, but it could be anywhere from Coffs Harbour to the Queensland border.)
Come to think of it, there's nothing particularly Australian about the way they speak, either. Not even a G'day or two. Or, to quote the late great Robert G. Barrett: "a really grouse feed." Oh, well. I'll have to work on my exotic locations and dialogue.
The presenter at a writing seminar I attended last week said writing about religion isn't the no-go area it used to be in fiction. Politics, however, is a third rail. Stay away, he said.