Final answer:
The US support of the junta in Argentina during the late 1970s and early 1980s is a complex and debated issue, as it led to human rights abuses and the disappearance of thousands of people.
Step-by-step explanation:
The question asks whether the US support of the junta in Argentina was justified at the expense of the 30,000 people who went missing. In the context of history, it is important to note that the United States did support the military junta in Argentina during the late 1970s and early 1980s.
This support involved financial aid, military training, and intelligence sharing. While the US saw the junta as an ally in the fight against communism, the actions of the military government led to egregious human rights abuses, including the forced disappearance of thousands of people. The justification for this support is a highly debated and complex issue.