On your response to point 6:- If Ponting can get provoked in a calm air-conditioned hall with just a question ("did you think you take a clean catch") and is justified to use whatever words he chooses, that shows how tough the Aussies are.
Aussies have used mindless and endless sledging on ground, in conditions that provoke far more, and hit much lower below the belt and tried to "mentally disintegrate" opponents.
Funny how an Aussie can be mentally disintegrated in a couple of seconds, and his defence is that he was provoked!