Makes sens to me that Emancipation has a "negative wave effect" on civilizations who run a non-Emancipation civic. Knowing that there is a better way of living outside, people seeks for change and sometimes makes revolution for it...
Gameplay vs story alert.
In a game like Civ, there are always two issues and two ways to view things. Gameplay vs story (realism).
In gameplay, the concern is having the best gameplay, most fun & enjoyable experience. To have good variety and replayability, which keeps the customer coming back and playing the game a lot. It also encourages the customer to look for and want the expansions and future versions of the product. You also want a big variety of strategies, to give a lot of different ways of playing the game. This, too, keeps the customer vested and playing again and again.
In story, you want to be "faithful" in recreating the story into the game environment. You don't necessarily want to recreate the story 100% accurately, because that wouldn't be a game... it would be a historical recreation with no variability (and thus no game). Furthermore, it is possible to "rationalize" the story... to come up with an explanation for a game mechanic that isn't exactly like it really happened, but it "makes sense". Note that a particular item may have multiple rationalizations, which could even be mutually exclusive.
And so. I'm talking entirely gameplay. You're talking entirely the story.
Also, I should point out that it is quite easy to refute a rationalization with a different rationalization. For one thing, I daresay there are 10 million muslims alive today who would disagree that they look across the border and desire to be emancipated. Not all societies are suited to all lifestyles, and there's no reason a society has to "ape" another one by adopting a lifestyle that doesn't suit it.
Lastly, even if we agree the rationalization you present is appropriate, it should logically be applied to all other aspects of the game. For example, Universal Suffrage should also give a negative penalty to civs which do not adopt it.
Wodan