Because the partisan demoncRATs on the 9/11 committee are directed to protect the Clintonistas and do all they can to destroy the Bush Administration - there was no value in letting such info. out - particularly given how much play their comrades in the media had over Bush + Cheney testifying together while ignoring the fact Clinton brought his consigliere Bruce Lindsey along with Sandy Burglar to join him during his testimony. Obviously, it's now clear, Burglar was tasked with destruction of all the incriminating documents he could get his hands on in the secret area of the National Archives, and then to join Clinton to coach him on what he could thus avoid having to say or admit during his testimony.
Now we know - it wasn't Bush who lied, Bush who knew as the liberal mantra goes - it's not confirmed as truth - JOE WILSON LIED & BERGER WHO KNEW!
PS - the reason why this info came out this week - it's clear from the news coverage - is that Berger has been officially notified he's the target of a criminal investigation and his attorneys are beginning damage control. Such incident would imply an indictment is forthcoming & given the precedent with Ellsworth & the Pentagon Papers - Berger will undoubtedly do prison time.