Whenever you guys can't make a valid case, you change the subject. Sandy Berger has nothing to do with the topic at hand, but regardless...
If there was any evidence that Berger stole or destroyed original documents, then they would have thrown the book at him. But there wasn't. Even if his intention was to hide or destroy evidence, he couldn't have because the materials he took were printed copies of documents that were safe and sound on hard drives. The people in charge of the archives stated that there were no hand-written notes on them. And despite the conspiracy theories, there's zero evidence that he ever stole anything in past visits, only wild conjecture. Since wild conjecture isn't valid evidence in a court of law (supposedly), he got the punishment required by law.
Back to the subject at hand...
The fact that Armitage was officially the first "leaker" doesn't automatically exonerate later leakers of any wrongdoing. If there was a concerted effort in the White House to punish Wilson by outing his wife, that is a serious offense. Fitzgerald was looking into that, therefore Libby needed to be questioned. Libby lied under oath about the chain of events and he was found guilty for it.
It is indeed a travesty that Libby is going to jail because it is most likely he was just a fall guy. The jury certainly felt that way after hearing the testimony, many of them wondering why Fiztgerald didn't pursue it further. Why didn't he? We may never know. But I think it's easy to imagine the firestorm that would have erupted if Cheney had been indicted.
We ended up with a case that had a narrow focus (the leaker) instead of looking at a possible underlying crime (an administration plot to punish Wilson).
The defense in the Watergate trials tried to do the same thing, make it all about the break-in and leave it at that. Luckily congress stepped in and broke through to the underlying crime.
But not this time.