I would like to add an addendum to my original point about Steele being sent against the Shivans. As Logistics stated, inevitably, the GTVA simply will not be able to stop the Shivans barring plot-****ery, due to the various reasons posted. This is yet another reason the Sol War seems so short sighted and stupid, seeing as how it wont really achieve anything.
I, however, am firmly of the opinion that said Plot-****ery has already occurred. I think the GTVA does actually have what they believe to be a viable, possibly even offensive, strategy waiting for the next Shivan incursion. My reasoning for this is simple - yes, the security council has proven arrogant and foolhardy in the past. Yes, the GTVA as a whole is mad with fear at the very thought of Shivans, and allows that to be the driving force behind their existence, but surely even they must realize that their empire is not infinite. They wont be able to play the game of containment for very long. Yet here they are, heaving their bulk around, loudly proclaiming themselves the true protectors of Humanity and waging war on their ancestral home for it's resources. We already know why the war was perpetrated, but if the GTVA didn't believe themselves capable of actually fighting off the Shivans then I doubt they would have gone to war so willingly.
I will also mention the possibility that said plot card is in Sol and that this is just one of the less spoken of reasons for the GTVA incursion.
Anyway, on the subject of the original point about Steele, my belief is that, come the next fight, the GTVA will actually have a workable plan or gadget for once, and Steele will have a set of rules to operate by, hopefully meaning he'll be doing less jumping at the unknown and more ... well, being Steele.
(I also feel like an idiot for never having posted this earlier. I have no idea why I did not.)