Ethics has everything to do with it if Australia started with human rights abuse you can bet that the UN and the rest of the world would be on our doorstep in a heartbeat.
In terms of mobilizing half a million troops in 48 hours that is ludicrous. Logistically they would have to organised personnel, arms, ammunition, army vehicles (Tanks, Jeeps, Missile Launchers and Artillery), naval vessels, planes, rations as well as construction and military equipment. Now the US ARMED FORCES has approx 1.429 million active personnel and quite a portion of those are currently overseas in foreign countries such as Japan, Germany, UK and South Korea as well as many more. To mobilize half a million personnel in 48 hours would be logistically impossible.
In terms of trade almost all of our trade goes through sea which is classified as economically exclusive which every vessel has freedom of navigation of now the Indonesians wouldn't be stupid enough to mess around with trade ships in this area as it would risk a embargo against them for breaches of international law particularly the law of the sea.
Militarily they may have a moderate army but they are nowhere near the same quality as ours they spend $8.4 billion dollars on their military annually we spend $25.3 billion annually meaning our armed forces are much heavily equipped, trained and prepared than theirs. On top of that their main suppliers are Australia, USA, China, UK, South Korea and other EU members now they are all much more heavily allied with Australia than Indonesia not only due to prior assistance and support but also because Australia controls an absolute ton of metals which any nation needs to continue a war of any type e.g. WW1 and WW2 see how desperate Britain was for metals when they couldn't get any of them for the war effort. Anyway over all their military may be bigger than ours but our army absolutely blows theirs away in terms of quality of everything else available to us and manpower doesn't always mean victory e.g. Germany in WW2