If you studied real history you would find out that there were two near annihilations of the Indo Aboriginal population judt before European arrival. Bpth were smallpox epidemics which covered the whole mainland from the north west and killed about 90 percent of the abor pop. Huge. The disease was introduced by Macassan fishermen and beche de mer divers from the Macassar islands. The second reached Eastern Australia just a few years before the First Fleet.
