In short, this story is about the workings of the human mind, with an unmistakable emphasis that people only come together when they have one enemy to defeat.
That idea is similar to the genre’s previous hits (especially They don’t wait), but it also echoes our real world, where (especially in an election year) everyone seems divided into warring tribes united by hatred of the “other” species.
Undoubtedly, this idea comes later Deep Space Nine arcs, such as when the threat of the Dominion’s invasion was enough to unite the Federation, the Klingons, and the Romulans.
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