I know I shouldn't continue, but here goes.
1.Lubu, what is your "your race or your passport"? Why would they invite you to Qatar with all its associated costs and resources to interview if they were going to fail you?
2. Would you mind telling me what aircraft would are currently flying? And what sim they put you in for the assessment?
3. If the US is short on pilots and offer special visas for Australians to work in regional airlines, how is that the fault of Australian pilots. Isn't that the same as Qatar Airways offering special visas for foreigners to live and work in Qatar. This is because Qatar Airways cannot find enough Qataris to fly all their aircraft.
BR
Drifter