
Just like the toxic bank assets the Obama Government has to clean out the torture legacy of George W. Bush. On one side Obama has to please the "Change" crowd on the other side is pure Realpolitik.
Now Obama has purely work to please US interests, he is now longer just a candidate that can condemn bad policies. Now he has to deal with ugly realities and problems.
Many CIA agents who did the dirty work wanted to stop, a few brave soldiers and agents refused to torture. But most of them simply followed the orders coming from HQ or the White House. Following "the orders" was also always the excuse of torturers from many countries.
It is so to easy and simply to label American Torture just a Bush problem. American culture has a violent streak, that is why it’s prisons are overcrowded, they still have the death penalty, throw mentally sick people into prison instead of handing them to a non-existent health care system and it’s national murder rate is the highest in the western world.

And there is the obvious lust for unlimited military power: the US spends more on so called defence than most other nations combined (including China, Russia, all Nato Allies, India, Brazil, etc.).
As a so called Christian Nation they behave philosophically more like Jews: an Eye for an Eye. Forgiveness is not very high on it’s cultural agenda. This is most visible with the justice system, the death penalty and three-strikes-law (you commit three criminal offences and then you get locked away for a long time).
There is a large portion within American society that sees itself as "besieged" and under attack from follow Americans (those dangerous "Liberals") and the rest of the world (Cheese Eating Surrender Monkeys and Muslims). They despise peacemakers like Jimmy Carter and applaud fictional strong men like Jack Bauer (from "24") as real world solutions.
Such a mindset ignores or at least tolerates torture, wars and an inhuman justice system. It’s a mindset that still sees the world in black and white, sees "evil commies" everywhere and is unable to apply long term and complex soft-power solutions to problems.