[cscheid]

(more spoilers)

You do make an interesting point which I didn't emphasize: Aurora also makes a moral argument against generation ships.

But I think things get more complicated still. If you accept the book's argument, accept cryogenic sleep, but also accept that Earth is something like the biggest generation ship we have, then where do we stand? If we accept that cryogenic sleep solves that part of the moral argument, then we kind of walked into Woody Allen's plot for Sleeper (that is, why not sleep right here on Earth until things improve?) These are really tough questions to consider.

Needless to say, I think Aurora is the deepest, most introspective work that KSR has produced.