Furthermore, Graner and his gang didn't do *anything* that could have even remotely aided our war effort.
Physical torture and humiliation are the forte of fiction writers, not modern Intel forces. Apply enough pain, and your prisoner will utter any words that he thinks you want to hear, truth be hung.
In contrast, real interogations involve feel-good drugs like ecstacy, beautiful women, and a wide variety of social and inter-personal relationships and situations that encourage extreme feelings of giddiness...and that lead to lose tongues.
Graner was as far from such freely loose tongues as could be put into words. Also, consider that while Graner felt comfortable leaking U.S. secrets to the news media, he's leaked no such "secrets" of the Iraqi insurgency.
So even by *your* own warped standards, that makes Graner either a traitor who is hiding what he learned from the enemy, or else someone who failed to learn anything from the enemy.