Maybe being paranoid, but it seems the spirit of openness promised after the Challenger investigation may be about to be compromised ?
Give a thought to just how open you think an investigation involving hundreds of interviews of innoncent employees ought to be.
What protection of private information does an Ad-hoc board answering to the public have?
At least with the AAIB and the NTSB there are established rules governing the release of personal information. I doubt that there is a similar statue on the books regarding Columbia, hence the private sector umbrella protection.
We can't have our cake and eat it too.