What if release of the information is actually vital to national security? And what about criminal activity? Is it proper for the president to classify something that shows the he, or someone he wants to protect, is guilty of a serious criminal offense?
I deny that it is impossible to determine if something is vital to national security simply by reading it. How then, do we decide to classify anything? Is the process entirely arbitrary? Then that should be changed. Lots of classified information is de-classified after a period of time and with bin Laden and the and Bush out of office, it's hard to imagine how it could impact negatively on national security. But even if it did, it would be the job of those who would keep it classified to make the case that there are circumstances that require it even though those circumstances don't meet the eye.
Anything that is the product of intelligence data or anything classified is deemed classified by default. It's only declassified after a review that evaluates whether any data in it has intelligence implications. (For example, the "he likes donuts for breakfast" bit above has no intelligence implications if the source that leaked the data has already been exposed.) Alternately, it's declassified after enough time has passed that nothing from that far back matters. (For example, when the Air Force released the information that the Roswell "saucer" was really the crash of a high altitude instrument package that they had known about from day 1.)
Just because you can't imagine how it could impact security doesn't mean there's no way it could matter--so long as the source is in place everything that comes from the source, no matter how trivial, has to be protected. You can be sure the other side is going over every fact and figuring out who knew it in an effort to pin down the leak.
(And note that you can't just do "he likes
donuts for breakfast"--the important thing is we know what he likes to eat, not whatever that food might be.)