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I have read stories in which there is lack of disagreement within societies, but I think they all involve group minds. It would be interesting to collect instances of fictional, super-rational entities who do not disagree despite being separate individuals. Of course it is hard to milk dramatic tension from such a scenario, so we might expect such cases to be only supporting characters in a story that centers on less rational actors.

In the novel Colossus (and movie), super-computer Colossus and its Russian counterpart, Guardian, quickly reach agreement on their goals and methodologies once they communicate. I suppose they had common priors, both being built for corresponding purposes, although one might have supposed their goals to be opposing. The author may have had in mind something like "objective morality" in which super-intelligent beings immediately deduce what is right and wrong.

Showing my age here, the Overlords in Clarke's Childhood's End are super-intelligent and are not depicted as being in conflict among themselves. One gets the impression that they are too civilized (one is tempted to say, too British) and have moved beyond all that.

More recently, the Sophotechs in The Golden Age and its sequels all agree, although again it seems that this is because right and wrong are supposed to follow from first principles. In the end there is conflict with extra-solar Sophotechs, but that seems to be because humanity has perverted the malicious Sophotechs and suppressed their ability to reason about morality.

It is often difficult, as Will Pearson points out above, to distinguish between commonality of goals and commonality of beliefs. One problem is that morality, the question of what is right and wrong, gets conflated with desirability, the question of what one's goals should be. Morality is arguably something that we should not disagree about, while it seems reasonable, given evolutionary competition, for everyone to have different goals. If a society is depicted as disagreeing about goals, that is OK. If they disagree about tactics to achieve a common goal, that is not. And if their disagreement is expressed in terms of what is right or wrong, that is also probably not reasonable.

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"...this shows just how radical is the claim that "rational" creatures would not knowingly disagree."

Given identical priors.

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It seems likely that rational entities with different goals could agree to disagree. Both parties in the Zebrowksi quote seem to agree that going, "beyond the realm of passing localities" would lead to change. They just disagreed on the desirability of that change.

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