Perth is supposed to be an easy one fo the Aussies to win, I think the last time Aussies won a home series after starting it 1-0 down was 1997.
i think disaster is also the manner of the loss. Bowlers being humiliated, batters failing. This sets up a psychological doubt that will carry into the next games. I imagine this is what being an English cricket or supporter feels like. An unending wave of optimism-crushing despair at the start of each summer.