I'd like to think that you are smarter than this and are merely wishing to argue, but I'll play along...for now.....
Was the threat of Cuba a military army being led into Florida? No...it was Soviet influence and their wishes to park missiles on our side of the world. We had them tucked nicely away in Europe. Why would we allow them to get that on us on our side of the world? The reasons we have embassies is not just to protect other countries and free trade, it is also about keeping threats on the other side of the world.
1) After his inauguration, Arbenz secretly met with members of the Communist Guatemalan Labor Party. In 1952 the Communist Guatemalan Labor Party was legalized. The CIA, having drafted Operation PBFORTUNE, was already concerned about Arbenz's potential Communist ties, and the UFC lobbied the CIA and the Eisenhower administration to take action, raising similar concerns once its landholdings had been expropriated. In 1954, the Czech weaponry arrived in Guatemala May 15, [1], [2] and the U.S. administration decided to commission the CIA to sponsor a coup d'état.
2) Allende was an ardent Marxist and, as such, an outspoken critic of capitalism. He advocated far-reaching social reforms through legal means. That made him deeply unpopular within the administrations of successive U.S. presidents, from John F. Kennedy to Richard Nixon, who believed there was a danger of Chile becoming a communist state and joining the Soviet Union's sphere of influence.
These South American Governments were in "talks" with Soviet powers or they were leaning towards a communists doctrination which would have eventually welcomed Soviet influence. It is not a difficult thing to recognize a future threat with current shapings. The security and safety of all people is to be able to recognize something that could eventually harm you and prevent it from becoming that threat. In dealing with the percieved threat, actions were taken and the local populations suffered. This is what happens when Americans demand security, and whine about the conflict that ensures it. The events in SA was a direct result of our wishes to stay out of a conflict, but be secure. Diplomacy and "non-combative" tactics are not always the right thing to do. But like I said...when protecting a country, it isn't as easy as "right and wrong." It's about neccessity.