The Jem'Hadar are controlled through the dispensation of ketracel white by the assigned Vorta. How are the Vorta controlled? Genetically bred to follow any order by any shapeshifter?
As for the question about the Vorta, they just seem to be genetically engineered to follow every order of a changeling, with the possible exception of outcasts (e.g. Odo, when he was banished)
I think the genetic engineering is probably enough for the Vorta. The Jem'Hadar have the genetic engineering
and the ketracel white because they are designed to be so violent so they need the extra leash around their necks to keep them under control.
But we have also seen Taran'atar bristle against the suggestion that the Founders control his loyalty to them by using the white - that he would be loyal to them even without it. We have also seen that the Jem'Hadar do not especially like the Vorta, that they only follow their orders because the Founders tell them to, because that is the order of things. If they were permitted, many Jem'Hadar would probably kill their supervising Vorta without a thought. And we have also seen some Jem'Hadar kill their Vorta anyway because they just pissed them off so much.
So perhaps the real purpose of the white is not so much to ensure loyalty to the Founders but to ensure loyalty to the
Vorta as a proxy of the Founders. As well as the knowledge that if the Vorta piss them off enough, and the Jem'Hadar do rebel (against the Vorta, not against the Founders), then it's not so bad because they'll die without the white in a matter of days anyway.
I'm still puzzled about what happened on Yadera Prime, as the people on that Planet seemed to have a peaceful society. Still Rurigan claimed that the Dominion changed the whole way of life of his species. What happened there, as the Dominion is in most cases hands off to it's members? It seemed they changed the governmental system and/or the culture of the Yaderans? If so, then in which ways?
There isn't really much to go on. But I do find it interesting that the Dominion were apparently happy to let that small colony of Yaderans go without chasing them down and exterminating them for having the gall to defy them. They apparently did the same to the Skreeans - they used to be under the heel of the T'Rogorans, but when the Dominion conquered the T'Rogorans, the Skreeans were able to escape, and the Dominion apparently didn't care enough to stop them. But I think I remember Taran'atar also mentioning that the Dominion put the Skreeans to work for them on a farming world one time, so maybe that wasn't all the Skreeans that escaped to Bajor? In which case again, why did the Dominion let that number of them go but not all of them?
There is also the strange case of the Dosi and the Karemma. Were the Dosi members of the Dominion? They certainly knew about them, but that doesn't necessarily mean they were members. Or maybe they were and they were just going about their day anyway, and so used to it that it didn't warrant mentioning. And then the Karemma were apparently permitted to engage in commerce with the Ferengi without that annoying the Dominion enough to stop it. Pre official first contact, the Dominion were happy for that arrangement to continue, possibly because it served their purposes as a way of getting intelligence on the Alpha Quadrant ("We learn more every day" - Third Talak'talan). But once contact had been made and the Karemma tried to change the details of the deal, the Jem'Hadar responded ("Starship Down").
So the Dominion will let its members worlds go so far if it serves their purposes. But beyond that, and they crack down.
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