RE: Get over it, we weren't at the heart of World War II
The South Seas Detachment that was assigned the task of capturing Port Moresby was something like a reinforced regiment, and the Japanese Navy, who was planning the PM attack, had to beg the Army for even that many troops. The Army just had no interest in the South Pacific, therefore the troops to invade Australia just weren't available.
All the Japanese Navy had for ground troops was the various Special Naval Landing Forces, and I don't think they had much more than a division of those altogether. So, the IJN didn't have the troops to invade Australia, and the IJA couldn't be bothered to send more than a few regiments to the entire theater.
It wasn't until the Allies began the counterattacks in New Guinea and Guadalcanal that the IJA woke up and agreed to commit troops in significant numbers to the South Pacific.
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