Let's look at Guatemala. This question refers to the 1954 coup d'etat where the leftist president (who was democratically elected) was replaced by a military regime. This happened in the context of the Cold War, when the US was fearing a domino effect - more and more countries falling to the left side of political spectrum, and eventually turning communists. The US intervention was bloody and caused genocide on the indigenous population so it was by no means wanted by the people. The correct answer is that they wanted to stop the spread of communism (they didn't support capitalism much since the new governents were military dictatorships, and those are not good for capitalism either).
