So what is a 'good' empire, then?
The people would democratically elect their representatives to the one central power, the internal policies and justice system would be fair and well meaning, the government would be as nice to the surrounding powers as the surrounding power would let them.
If there's ever a story about someone "seceding" from the Federation ...
If you want to venture into the realm of the non-canon, the novel-verse a few years back had a storyline concerning the departure of Andor from the warm embrace of the Federation.
When Star Trek was still new, Gene Roddenberry was asked how big the Federation was, he said it could be a dozen worlds or a million (I've always seen that as a really good answer).
Mixing canon and not, the FASA role playing game had the Federation at about 1,500 members during the TOS era. But by the time of the movie First Contact, Picard stated the number was 150 plus. This could be an indication that membership in the Federation is rarely permanent.
The Federation in the 24th century didn't rise to 150, it had
dropped to that number
One possible explanation for the decrease is that some fans see the Federation of Kirk and the century later Federation of Picard as being fundamentally different. The former being a UN, the later a federal government. The transition resulting in 90% of the members canceling their memberships.
For me, I don't necessarily think that a secession story will necessarily be about the people under some alien influence to disrupt the Federation. It could become a discussion about what the Federation has become and what it used to be about ...
I tend to see it more as a canceling of a membership, and not a "secession."
Putting that to the side, there could be many reason to want to enter the Federation, but also as many to want to later leave. France left NATO in 1966 because (simply version) de Gaulle felt it was being dominated and he wanted France be more independent. If Federation members are equal only on paper, with some members being "more equal" this might result in departures. The original founding members having a UN security council style power arrangement might be built into the Federation's charter.
Taking that cue, Earth, Vulcan, Andor and Tellar, may be similar to the US, Russia, China, UK and France in that they are the permanent members ("founding members") of the Council and have certain sway in votes or matters.
In TUC, the Federation government opened dialog with the Klingon government because the Vulcan government told them to.
... the Federation takes several cues from the UN, including a council, and only one, rather than two houses, like many other powers. It has a president, who we are not sure how is elected, and a single council, who's members represent their worlds.
It's interesting that while the Fed Prez self-describes himself as the "commander-in-chief" it very obvious that the Council actually holds that position and power.
I wonder if the Federation even has had a President for the majority of it's history. We rarely hear of such a person and it's possible that the office come and goes with occasional reorganizations. The majority of the time it's "The Council."
... Kirk facing the Federation Council and President, rather than a court-martial.
The President at that point in Federation history might have been reduced to a mere figure head, it's difficult to imaging President Obama presiding over a naval officer's courts martial.
Maybe we are too cynical and not enlightened enough to understand how the Federation can work
It' a home owner association, with a really good citizens watch.
