- Japan, who were occupying Indonesia, as they realized that WW2 was lost, met with Sukarno and Hatta and offered Indonesian independence
- then the Dutch, colonizers for 350 years, attempted to re-take Indonesia
- the US told the Dutch to get lost after almost 400 years, and Indonesia was able to proclaim independence.
So first off, the US is primarily to thank for Indonesia's early post-WW2 self-determination.
- after WW2, communism was being promoted by both Russia and China world-wide. The US encouraged the Indonesian leaders to avoid that. Part of the problem was ethnic politics and loyalty - Chinese businessmen control finance in SE Asia, and the native Indonesian leaders decided to do something about that under the guise of "communism bad"
- the US until today is the primary military supporter of Indonesia, training virtually all of their air force pilots. The C-130 and F-16 are their main aircraft.
So when people criticize US involvement in Indonesia, I remind them that the US is their biggest friend, from 1945 until today. In return, the US has never colonized that country in any way.
For those who haven't visited Indonesia, the country made huge economic strides from 2000 to 2019, and if not for corona, would be doing very well economically. Central Jakarta, the capital, is very nice.
Regarding the South American anti-communist actions, that is what it took to prevent it taking root. You can see what the alternative is in Venezuela, a former oil exporter, essentially a destroyed country because of it.
Or closer to home, the burning of our downtowns by Marxists.