idk if you saw my second comment, but I think this explains it
Those who walk away are those who are even able to live in a non-Omelas, those who are able to imagine even the possibility of not having a hidden evil at the heart of a perfect world. The reader who does not walk away from Omelas, lives in Omelas and has lived in Omelas for their whole life, in the sense of mentally inhibiting the world in which any Omelas must have the tortured child. Those who walk away are therefore the very few who are able to reject that mental world, leave it, and achieve all the good rather than just the good that comes at a tragic cost.
This makes sense, especially given when Le Guin says “The place they go towards is a place even less imaginable to most of us than the city of happiness. I cannot describe it at all.”. If she did describe it, the reader (who has not yet themselves left Omelas) would assume that place also has some horrible secret, and so her attempt would fail.
idk if you saw my second comment, but I think this explains it
This makes sense, especially given when Le Guin says “The place they go towards is a place even less imaginable to most of us than the city of happiness. I cannot describe it at all.”. If she did describe it, the reader (who has not yet themselves left Omelas) would assume that place also has some horrible secret, and so her attempt would fail.
I really like this interpretation