Lagon, “We Owe It to Them to Interfere”

First, when reading articles like this notice how the author emphasizes the idea of metaphors evident in Star Trek episodes. Also that he notes that these metaphors he identifies may be intended or unintended.  Why is this last point important?

What are the five central themes in Star Trek that Lagon connects to American foreign policy?  What specific examples or evidence from ST episodes does he cite to support each theme?

           
In what does he see the old Star Trek as helpful in understanding post Cold War foreign policy in the 1990s?