Nornagest comments on The Aliens have Landed! - Less Wrong
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It's also likely that an advanced alien species with an interest in getting rid of humans would do it by creating some nasty nanotech or redirecting a few asteroids, rather than going through this elaborate and unreliable blackmail scenario. It's not a dilemma if you parse out all the practical considerations, so don't.
Suspension of disbelief is important for what-if scenarios. I find little black spheres to be weirdly possible given a particular world-state ("crazy aliens"); thinking of 90% of humans being kidnapped evokes a very different possibility-view of the result. I can't stop thinking about post-apocalypse movies in the latter case.