My first fandom was Blakes7 (see icon) and one of the key lines in the climactic episode is "Have you betrayed us? Have you betrayed ME?" spoken by someone whose girlfriend turned out to be the contemporary equivalent of a KGB agent.
In my current fandom, Firefly, Mal reacts very badly to an attempt to turn in a crewmember for a very large reward, on the grounds that turning against anyone under his protection is the same as turning on him.
In Farscape, there's an episode where it's shown that Aeryn turned in her lover for political subversion, although not much is made of it.
I'm not sure why it's such a huge theme in fannish media properties, except perhaps that we perceive a ship as a relation of absolute trust between two people which is always at risk of disruption by betrayal.
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In my current fandom, Firefly, Mal reacts very badly to an attempt to turn in a crewmember for a very large reward, on the grounds that turning against anyone under his protection is the same as turning on him.
In Farscape, there's an episode where it's shown that Aeryn turned in her lover for political subversion, although not much is made of it.
I'm not sure why it's such a huge theme in fannish media properties, except perhaps that we perceive a ship as a relation of absolute trust between two people which is always at risk of disruption by betrayal.