In Germany, schoolchildren are forced to learn about the atrocities they committed during WWII. In Japan, from what I understand, this is not the case - the children don't learn about things like the Rape of Nanking.
How can we possibly learn from our mistakes, from our nation's misdeeds, if we are never made aware of what we did? Yes, there will be more violence because of the release of the report, when others see our truly dirty laundry. But that's what we get for having committed the crimes to begin with. Maybe next time, when we're faced with the choice of whether or not to torture, we'll know better because of what happened with the release of this report.
After all, when we committed that torture, did the United States of America face any truly existential threat? I ask because when George Washington stated his opinion on torture and mistreatment of prisoners, even the possibility of a United States of America was very much in doubt:
"Should any American soldier be so base and infamous as to injure any [prisoner]. . . I do most earnestly enjoin you to bring him to such severe and exemplary punishment as the enormity of the crime may require. Should it extend to death itself, it will not be disproportional to its guilt at such a time and in such a cause... for by such conduct they bring shame, disgrace and ruin to themselves and their country."
-- George Washington, charge to the Northern Expeditionary Force, Sept. 14, 1775