Labor did that to themselves with the Rudd/Gillard debacle, they were never going to be elected. They put Rudd back in charge to limit the damage.
Abbott actually took a leaf from Rudd in his campaign. Rudd did exactly the same thing to Howard, had no policies and just went after him negatively.
This is what the Australian public do, they get sick of one leader and then vote for the other guy. What they don't think about is how bad the other guy actually is and then they get a reality check once the new guy comes into power.
I agree re the debt, they are being exceptionally dishonest there. Government debt is nothing like household debt and during the GFC the stimulus played a big role in keeping us out of recession. That is basic economics but these guys just parrot bullshit.