Well it actually is beyond comprehension, because the Australian public is fed only doom and gloom from the media and the politicians, who have given the scientists free reign to run the country. What people don't realise is that the economy will suffer if this continues. Australia needs international students and tourism. The economy is doing well now, but all the staff now who work in the international travel sectors (such as Qantas staff) are still being supported. When these jobs are lost - it is another hit to the economy. The country can't run on coal and iron ore forever - yet economists are basically not speaking now.
Secondly who is the "we" that you talk of? Because my understanding is it is the scientists, and them alone. And they want 0-covid, which is not a realistic target. Even with borders closed, there are still cases that eventuate - as we can see in Perth right now, which leads onto my next point.
Why do you shut down two cities (Perth and Peel) when you have track and trace? Do you not trust your systems in place? So if 2 cases is enough to cause a snap 3-day lockdown, what hope does anyone have of international travel?