Indeed, all situations in which one is powerless share that I think. It makes it frightful, but does it make it wrong? I don't necessarily think it does. Assuming for the moment that those stipulations stand (for reasons not necessarily related to the story) is pain abolitionism really as bad as it seemingly is represented in the story?
"The kind of classic fifties-era first-contact story that Jonathan Swift might have written, if Jonathan Swift had had a background in game theory."
-- (Hugo nominee) Peter Watts, "In Praise of Baby-Eating"
Three Worlds Collide is a story I wrote to illustrate some points on naturalistic metaethics and diverse other issues of rational conduct. It grew, as such things do, into a small novella. On publication, it proved widely popular and widely criticized. Be warned that the story, as it wrote itself, ended up containing some profanity and PG-13 content.
PDF version here.