I did and I also know that the Shivans by eliminating the Ancients enabled the survival of the Terran and Vasudan species. But why are the Shivans then fighting against Terrans and Vasudans? Its not that there are any lesser Races around that have to be preserved. Perhaps they preserved Terrans and Vasudan from themselves? But if that's true wouldn't there have been an easier way to do this instead of trying to destroy Earth or blowing up Capella? Sometimes I get the feeling that Volition never had any real ideas of how to end the Freespace series and included the supernova because it was 'cool'.
In answering this, the Shivans weren't preserving the Terrans or Vasudans from themselves. They were ensuring the survival of another race that would show up about 300,000 years in the future or so. The T/V races had grown so much, like the ancients, and were continuing to expand. The only difference I see between the Terrans, Vasudans and the Ancients, is that the Shivans showed up when the Terrand and Vasudans were in the process of obliterating one another, causing them to band together. Whereas with the Ancients, they were so big and indomitable, they anhilated any and every other race they rubbed elbows with.
My own personal speculation as to the story which got interrupted, is that the T's and V's would learn from the Ancients' mistakes, and show the Shivans that they didn't need to destroy the current intergalactic superpower to level the playing field for all the up-and-coming species competing with them. I would think that the Terrans and Vasudans would realize, upon successfully allying with one another, they would do so with other races they come across, thus nullifying the need for the Shivans altogether. Sorta like, today we have hundreds of nations, which in the FS universe, ultimately merged into the GTA. I believe that no species that's come before (and been destroyed by the Shivans) knew how to unite this way BETWEEN species, the way the Terrans and Vasudans had to in order to survive the Shivan onslaught. The game talks about the Ancients having enslaved other races, but never allying with anyone mutually as in the case of the GTVA. See where I'm going with this?