*snip*
The amount of unsupported conjecture presented as fact in this post is luverly.
The Shivans may not, probably don't in fact, have any conception of the depth to which Terran-Vasudan power runs. They simply had no way to accumulate such knowledge in FS2, except through Aken Bosch, and given what they did the only real conclusion along those lines is that Bosch feed them a gigantic load of crap involving a Terran-Vasudan fleet many hundreds of times more powerful than it actually was backed by enough Colossi to make even 80 Sathanas juggernauts worry. (Assuming they even needed the Colossus to do so, which they probably did not. Massed destroyer/corvette assault will probably work just as well.)
I've already posisted that the atmosphere and integrity of the IP (i.e. the growth and change of the Terran race) is best served by the defeat of the Shivans. In the end, in fact, I think I can make it stick without even having much trouble.
The Shivans are both the destroyer and the preserver; they are an imperfect tool, because all that they preserve they must eventually destroy. We know of no other means of faster-than-light travel than the use of subspace. There is no reason to think that any is possible. All or nearly all races will enter subspace and travel beyond their home systems. The conclusion presented in the FS1 ending that they preserve those not yet able to defend themselves by eliminating the others who could reach them is thus true, but presents a grossly flawed system.
But in forcing Terran/Vasudan harmony, in demonstrating that both species are terribly outclassed, the Shivans have rendered themselves redundant. Terrans and Vasudans will not make war on any other civilization they discover. They will extend the hand of friendship and try to make alliance, because they
need allies. The Shivans were the symptom of a bigger problem, but they were not the solution. They created such a solution inadvertantly (or was it?) instead. Now they are the problem themselves.
And now just consider the first invasion... the Lucifer Fleet for another moment... a threath that the GTVA was actually able to match... did the Shivans seem even remotely concerned with losses or self preservation or an "avoidance" of conflict, while you pretty much completely took the Lucis supporting fleet apart ?
This in particular I have to take exception to. Canonical evidence is firmly in the concept that the Shivans were in fact mindful of their losses (the mission to capture the Taranis says as much), as any competent military force would be, and even after the loss of the Lucifer still could and did make a fighting bid for victory. (ST's mission "Hellfire" outright says as much.) The conception of the Shivans as a swarm of insects like ants or bees is shiney and distracting from the truth. They are very competent practioners of warfare, and they
are not stupid. They are manuver warfare on an interstellar scale, well-versed in exploiting shock effect and hampered enemy reactions, going after the only targets that truly matter on that scale (jump nodes, the choke points and foundations of interstellar travel), and well aware of how to use their superior mobility (advanced subspace technologies) to best effect.
The FS2 Shivans demonstrate the same skills, but on an ironically much smaller stage.