>I'm hard pressed to see where the 'protect our own'
>angle internal to the Corps would have them driving the invasion.

Well, its not directly related. Kind of more of a side effect that given the psi corps hidden agenda of Psionisists are the superior beings and are supposed to be in charge, they tend to make sure that people they can control with minimal amount of effort are in their puppet positions. Remember that the Psi Corps we are the future and you are ours agenda is kept as hidden as possible; only the high command on both sides of the issue and those responsible inside the corps for making it happen are breifed in on it.

this results in persons in higher command positions than they are competent to manage, you see, and results in the sort of thinking that kicked this off. "Hey, lets do this while we know everyone's at that Hutchins brat's wedding and not here", as three posts up put it without, as ReRob pointed out realiszing that ALSO means that all their heavy hitters are in one place and ready to decend on them like the wrath of god.