He knows.
He knows this is a manufactured controversy.
He knows the 'evidence' is being fabricated.
He knows that when (not if) this comes out his profession will be DESTROYED.
This is not altruism or any kind of devotion to "truth."
This is attributable to the best motive of all:
Enlightened self interest.
"This is attributable to the best motive of all:
Enlightened self interest."
Bingo. We are on the same wavelength only you put it more succinctly.
In addition -- he's trying to create an atmosphere of "no law broken" so that when it's revealed that it was a reporter who outed Plame, the public will have been trained to say "no law broken."