According to Mabo (which has rendered them 70% of Australia) they never had a legal case for owning the Continent.
Ownership is a legal issue - and they know it or they wouldn't have planted future legal arguments in their Uluru treatise. (African reference).
It's an orchestrated campaign to assuage inferiority complexes lead by the Chief Squire of Inferiority Complexes himself.
Karma will be the erosion of good will towards the 'mob' when the rest of Australia works out what they really think of us. And forget a Blainey-like gratitude - sure the good Lord doesn't look highly on institutionalised 'deadly' grievance.
