Why would a pro like Sandy Berger risk his reputation and career to steal documents?
I have come up with two possible explanations.
He found something very incriminating about the Clintons' handling of terrorism and was sent back there by the Clintons to cleanse the files.
OR
This was an attempt to damage John Kerry. Hillary, the RED QUEEN who has files on everyone, made him do it, and then leaked the info to the press.
Sounds crazy, I know. But with these people, anything is possible. The latter scenario is far more likely. Hillary! has her sights set on '08, and she's not going to let Kerry get in the way.