> The U.S.’s Skylab embarrassment over Australia resulted in no human injuries. President Jimmy Carter apologized for the mess. The city of Esperance issued NASA a $400 littering ticket that they never paid.
Or sensibly they want to set the precedent that AU$400 is the appropriate amount!
https://en.m.wikipedia.org/wiki/Kosmos_954
And as the article says, states are already obligated to do so under the outer space treaty.