Bad thoughts wrote:
but there are only a handful of examples of enforcement for violations of the Prime Directive: Omega Glory ...
Captain Tracy was arrested for killing large numbers of natives, and not apparently for violating the PD. It was obvious from the start that he had been interacting with the natives, yet initially there was no concideration of arrest. Discussion of a arrest came only after Spock discovered the native bodies.
The Old Mixer wrote:
"Redemption" is a particularly bad example of your point...staying out of another planet's civil war is a very sensible example of the Prime Directive at work...
My read is that it wasn't the PD that kept the federation out of (what they thought) was purely a Klingon civil war, but rather "non-interference" in a foreign cultures private matter. Once it was confirmed that it wasn't internal, a standing mutual defense treaty came into play.
You see, the fact that the federation proved the romulans were helping the Duras family is of no consequence; everyone in the Duras family already knew it and supported it.
Except it wasn't the Duras family fighting chancellor Gowron. It was the Duras family's coalition fighting Gowron's loyalist coalition. Once the Duras sister's connection to the Romulans was confirned, the Duras sisters no longer possessed a coalition. Their support among their former allies disappeared. The allies would switch over to Gowron, or simply stand to the side.
Why would the Romulans continue to aid one