I feel like you are overlooking the fact, that Australia GOT invaded by the Brits. The isolation did not protect them. It slowed down the change between them and others. Cultural, economic and technical exchanged helped many countries. Change often has a negative side to it, but I think the “gradual” change of exchange is more welcome than the sudden change of invasion.

for this amount of money they could stop the war themselves, no? This is such a gigantic, non imaginable number…

Even with 500 a piece and 1000 drones, they would have 0.5 vs 16