This is different. It would be similar to a post-Pearl Harbor Commission
burying the report by the radar operator.

There is clearly a major coverup about the program, and we can only
speculate why. My guess, and only that, is that the program's goals
and techniques were, and still are, regarded as top secret. In
addition, it was (and probably still is) of dubious legality. Couple
that with the points that Chuck made regarding no known criminal
actions at the time, just an inferred chain of circumstantial evidence
which probably implicated a lot of other people besides Atta. Although
there may have been a bungle here also, I'm still convinced that the
really criminal screwup was by the FBI for not following up on the
flight school tips.