Things must play out exactly as they currently are to ensure Australia acquires its future time powers. Changing the past would likely make it so that Australia doesn't eventually come to control the time power in the future but some other country does instead, and thus the past could never have been changed by Australia to prevent bad things from happening, which would again put Australia in control of the time power since the past was never altered. The only possible future is one in which Australia doesn't fix the past, and all other possibilities self-correct back to this alpha-timeline.

Why blame us? Kiwis know before we do.
Maybe they are too busy cosplaying LOTR or We Were Soldiers.

It's difficult to do with all the blood rushing to their head

They keep trying to text us, but it shows up upside down

Because suffering scours away the parts of us that are not Australian

Ever notice how all the world's worst animals only evolved in Australia?

They saved the rest of us, but they couldn't save themselves...

Yeah, Australia. Harumph

—North America