Pavonis said:
I doubt the Federation would allow a member world to engage in a devastating civil war.
The Federation might not have much say in the matter. If it was a short civil war with a coup, by the time Starfleet was in position to do anything for the former government, a new (and popular) government might already be in place. In the interest of stability, the Federation might order Starfleet to stand down. There are occasions where both civil wars and to a lesser degree coups serve a legitimate purpose. It was a (British perspective) civil war that brought the United States into existence.
First, the OP was asking about a
devastating civil war, not a short bloodless coup d'etat.
The OP wanted to know if the Prime Directive only applies as long as the civilization has warp drive and other high-technology of their own development and maintenance, not whether the UFP cares about internal politics.
My response was, and still is, that once a civilization is a member of the UFP, they're not subject to the Prime Directive anymore. If that's the case, then under any circumstances that happened to cause a civilization to lose some high technology (say, warp drive) that would otherwise isolate them, the UFP wouldn't suddenly consider them SOL and kick them out. I figure once you're in the UFP, you get the benefits of membership, including assistance in developing and integrating new technology into the planetary society and maintenance of that technology, too.
I suppose it may not be that way, though. It could be that continued UFP membership is predicated on the independent maintenance of your privately developed technology, and sudden regression in technological ability would invalidate the membership, and cause the PD to kick in again. That just doesn't sound very, well,
friendly to me. What's the point of the UFP membership in that case? What's the point in joining if a member society cannot count on the assistance of the other members when needed?
Second, why wouldn't the Federation Council ask for a referendum on the new, supposedly popular, government? If it's legitimate, it'll win in a vote. Of course, I'm assuming that all UFP members are democracies. Maybe they're not. Still, I can't imagine that the UFP central government would allow a coup to occur on a member world without asking a few questions. They're not as passive as all that, surely.
Myasishchev said:
Tasha's homeworld was much more likely a human colony that just never joined the Federation, like New Sydney.
Which would make it United Earth's responsibility to intervene, if it was still a colony. Without Federation assistance, United Earth might have been too weak by the 24th century to project enough effort to solve the problem.
Why do you assume that all humans are subject to the United Earth government, or the UFP government?