This (your post subject) came to mind for me again too, with the formal conclusion of the anthrax investigation.
Haste Leaves Anthrax Case Unconcluded
By RICHARD BERNSTEIN - February 24, 2010
http://www.nytimes.com/2010/02/25/us/25iht-letter.html
One long road culminating in one suicide.
There are also UN conventions about obliterating monuments, buildings, archives, and books. Over all there seems to be a tacit, unspoken agreement internationally to not speak about these things publicly,
using national security as tactical device, e.g.
Bosnia's National Library, memory.