So true. Although there was substantial 'flak' from the Nipponese around the entire continent of Australia - Darwin being the worst.
The Nipponese saw no real advantage of invading Australia as a whole.
Its pure beat-up of fear & warmongering by military orientated Australians who rely heavily upon USA/UK alliance.
Its like a myth busted just like how we were told Wentworth, Lawson and Blaxland "Pathfinded the way across the Blue Mountains like the great Australian Pioneers that they were." What a croc! They just asked the Dharruk tribe "How?" and got "Just follow that track there Gubba".

- talk about an undersized fish caught and the records rigged to tell a very big 'fishy' tale indeed.
Ask any Nipponese who's father fought in WW2 and they would laugh at the idea of 'Invading Australia'. They saw Australia as just another Anglo-Saxon American 'outpost' Island ...much like Guam was for Nippon. But besides being far too large to mount a full-on invasion, it served no direct strategic value for direct assault upon the USA - so they just hampered any military avenues instead.
Can you imagine the Nipponese having invaded Australia and then finding it full of dirty filthy Ferals demanding that they "Save the Trees"

. Not only that, the Yobbos would probably have the entire Nipponese Army drunk on cheap beer constantly while turning bland snags on a BBQ.

If Australia stayed Neutral the Nipponese had no intention at all to invade or molest.
General Macarthur was a lunatic madman - he actually helped orchestrate the Korean War under the belief of Yin/Yang meaning that the entire Northern Hemisphere should be "all white" via a Cold War connestion with the Soviets. "To rid Asia of the Mongol scurge" was his own words. Which meant to push the Yellows outta Asia and down into Australia/Oceania ....and thats where the constant propaganda of Nips invading Australia came from.
...So much for USA "allies"

...and still such a belief is practiced today. What an absolute joke!