It's second hand, but at least it shows that some who played a part in turning America into a torturing nation do not retain Cheney levels of shamelessness:
"I've heard him express regret at the contents of the memo," said a fellow legal scholar and longtime friend, who spoke on the condition of anonymity while offering remarks that might appear as "piling on." "I've heard him express regret that the memo was misused. I've heard him express regret at the lack of context -- of the enormous pressure and the enormous time pressure that he was under. And anyone would have regrets simply because of the notoriety."
The question is what actually constituted the "enormous pressure." And whence it came. But there is one thing he could do to prove exactly how he feels: resign. Be the first person to express real remorse for the crimes committed. And then explain in great detail what he was instructed to do.