Graner's sentence was appropriate for a variety of reasons, not least among them because either he, his co-horts in crime, or his attorney illegally leaked the evidence of his crime (the photos) to Mary Mapes of CBS in an attempt to blackmail the Bush Administration into giving all of the perpetrators lighter sentences.
It was through CBS that the NY Times obtained those photos that lead to 41 straight days of front page Abu Ghraib scandal stories.
Such evidence for criminal trials is illegal to leak under both U.S. civilian and UCMJ statutes, as well as it being a violation of the Geneva convention to take and publish humiliating photographs of prisoners.
So don't try to re-write history into having some sort of "Saint Graner."
He did the crime. Now he'll do the time, and *nothing* that he's done to date merits leniency or sympathy on our part.