Again, the provenance of a particular morality is bounded by space and time, but the application of it is not; the american judges the chinese with the american morality, irrespective of what chinese society might say.

It is valid, and normal, to discuss morality of actions occurring in different places, without including the morality of that place itself; in this case, stallman isn’t talking about the remote island’s morals, but the morals of where he is and how it applies to events elsewhere