But heaven forbid (and may God protect you) if you use your government-approved firearm to protect yourself or others...
Australians also do have the right to use reasonable force - including lethal force, if necessary, in self defence.
You may have to convince a jury the force was reasonable, and I do think there have been some cases where the police have been overly zealous in trying to get cases to court when common sense should have made it clear that it was self defence, but in the end, the courts have generally got it right even in those cases.