While I agree with a lot of your analysis, I have to mention that Curt Weldon, who has written a book about national security, is certainly in a position to know, through all his research about this matter, whether a hearing will compromise assets currently in place.
And there are work arounds for dealing with that.
What we really need to know, and what our committee should be able to control, are three things:
1) Was Atta and the Brooklyn cell identified pre 9/11.
2) Who was told about Atta and the Brooklyn cell.
3) Who shut down Able Danger and ordered information destroyed.
If those questions can't be answered without hurting national security, then how is it that the 9/11 Commission was able to hold months of hearings which asked questions of our intelligence agencies?
Hearing starting now...