Oh, c'mon! I left the Air Force with a souvenir aeronautical chart and this is the same sort of thing. The only possible response to treating it as a serious failing is "get a life!"
Yes, if the aeronautical chart were a unique and irreplaceable document, which you knew would be of value to a Presidential (or war?) library, then indeed it is the same sort of thing. But if it were merely a cool item, readily replaceable, then it's not the same thing at all.
Remember, Williams acknowledged that he was "perspiring heavily" upon realizing that he might have lost this valuable document. He knew the gravity of what he had done.
Of course, compared to what Berger, Billary and others have done, Williams' theft is "small potatoes." But it is still serious, especially for a supposedly ethical journalist.
I wonder how many conservatives will read (or listen to) the Williams interview, and upon noting his positive assessment of Rush will "give him a pass" for his unethical activities. You just KNOW that if Jennings or Rather had taken a Reagan administration document, the conservative movement would be ALL OVER them.