Anyone that has been in this unfortunate position well knows the amount of insidious commercial pressure to continue when fatigued. I also wouldn't be surprised if the crew involved were based in Melbourne. Everybody should have realized by now that the standard airlines response to the "We were fatigued" statement will be "Why were you operating then?"
They treat you like you just signed on from a relaxing overnight in a fully sound proofed 5 star resort/hotel, not where crew get to stay.