I doubt that it was their idea alone to permit him to do this. People in those jobs know that the person at the bottom of the totem pole is the one most likely to get fired first, so I don't think they would have taken it upon themselves to violate the rules so blatantly.
I suspect they were told by some superior to let Berger do this; and that that superior had been told by someone else to give Sandy free rein. Since the first person the archivist called after the theft was detected was Bill Clinton's lawyer, I think we know where this all goes. Even though the lawyer was the NA's liaison with Bill, there was no reason for Clinton to even be involved in this - they weren't Clinton's private papers - but he obviously was.
I agree. But I'm inclined to look in the direction of Gorelick.