You've obviously got a lot more experience trying to defend your national teams performance in the World Cup than I do, but for me at least it's less about the result and more about how we've been going about it.
Losing 4-1 to the WC Holders isn't so bad. Losing to them 4-1 trying to defend, contain and park a bus across the 18yard box is not what Australian teams are known for. It's not how we, always under skilled and manned, take on the best teams in the world. Losing 4-1 but throwing everything at them, being assertive, hitting tackles hard, pushing and hassling and making their life hell would be acceptable.
If we don't attack, we don't score. In the first game of the World Cup you throw everything out there. Once the first games are done in your group you can start to tinker with a more defensive game if you need to prevent a loss, or a more attacking if you need a win.
The only chance Australia had of getting into the 2nd round of this group is by throwing caution to the wind and just going for it. Try to play a containing game will guarantee we go home on the first flight after our third match.
So if they'd thrown caution to the wind and harassed hard and lost 6-0 for example, would you still have had the same response? Or would you have said something like "we could have had least played more defensive to contain the goals against, if we lose out after 3 games on goal difference I'll spew up".
I've no doubt that if that outcome had occurred and Australia had lost 6-0 but played expansive, people would have complained just as much.