right so a sign of not "doing nothing for thousnads of years" is developing mroe effective ways of killing people??
you need to consider colonization of australia contextually
1. previous europeans had visited australia, looked around, and left. abr in 1788 would have remembered that, and not expected colonists to stay. suggested that therefore no need to launch immediate attack; they woudl leave soon.
2. when it appeared the europeans weren't leaving, still abr were not informed of the european interpretation of the situation- the europeans (being so great and having spent so many years making weapons and writing about civilisation) just presumed because they were so great it was the natural order of things that they would colonise aus. they thought the land was terra nullius, empty with no one there, and if there was someon there then it didn't matter because they didnt' cultivate the soil. this is total rubbish. abr people have a complex relationshp with the land/totemism, and there is evidence of abr people attempting to make land claims by giving birth on land where other abr groups had been exterminated (eg cardigal? people from small pox).
=== for these reasons, possibly saw no reason to launch full scale attack.
also important to remember is that the history of this period is written by white settlers, squatters, governors. in many of these narratives abr responses superficially are written off as children's pranks (to avoid problems with etiquette of war, and contradictions in way land was colonised).
amount of soldiers on horseback with guns to ward of "children's pranks" is a bit weird, and casts doubt on whether abr protest was a passive/insignificant as white settlers' accounts suggests .
instead of confrontations fought on a battle field between trained fighters, (although there were cases of this) massacres were more common in areas the abr people had been confined, with the murder of old, young, men, women, children. this is a war crime, and so it was helpful for the europeans not to consider the events in terms of war.
under international law australia was "settled" as opposed to "conquered" of "ceceded" and therefore narratives of war, of retaliation, would contradict the way in which australian was formally and legally colonised. militant accounts in many cases were repressed because they did not fit with the claim that the land was peacefully settled by colonists because there was no one cthere, and if there was, those people didn't 'own the land' anyway.