Have you, personally, been to Australia? Have you seen it?
If not, then you must agree there is no direct evidence for its existence, unless you take the word of others. But why would you trust them? Such organizations as
NASA claim to have been to Australia, do you trust them?
There are flights supposedly going to Australia, but they are instead going to an outpost in the Mojave Desert. After all, Australia is supposedly mostly desert: quite a coincidence it looks a lot like areas in the US where few people travel, isn't it?
We have established there is no reliable evidence for Australia. It has not been personally verified, and those who claim to live there are either shills or don't understand that they are in the Mojave Desert.
There is also motive: money that would be sent to the country is instead added to the Conspiracy's coffers.
To make it clear that this is a topic for FE debate, I will defend this perspective with FE tactics, and I will point out how this would benefit FET: if the Southern Hemisphere/plane did not have the land in it is commonly thought to, many issues (relating to the Coriolis Effect and flight times) would quickly vanish. Removal of Australia is the first step.