Its not a question of ACLU credibility. The memorandums were written by FBI agents and obtained by court order directly from the administration. No one is questioning the validity of the documents.
Rodney's comments below also indicate some serious confusion about the designation of the detainees. To hysterically declare "This is war!!!" and then use your own unsupported declaration as justification for torture demonstrats a curious lack of rational thought processes 
The detainees have been convicted of no crime - and apparently the US courts disagree with the Bush administration that treating people like something less than animals is A-OK. The first of the detainees to come to trail has been granted the same legal protections, legal representation that any prisoner in US custody would recieve.
We do this because (some of us) are not barbarians, because we would like the world to believe *most* of us are not barbarians, because doing less dissolves the moral high ground we (used to?) enjoy in negotiations, because torture produces notoriously poor intelligence and because we hope not torturing will reduce the liklihood our own will be tortured.
http://www.timesonline.co.uk/article/0,,11069-1411944,00.html
"Secret FBI memorandums, which the Bush Administration was forced to release by a court order won by the American Civil Liberties Union (ACLU), reveal the disgust of FBI officials who witnessed the abuse.
They also show that violence against prisoners, including the use of snarling dogs and forcing detainees to defecate on themselves, was still an interrogation tactic months after the Abu Ghraib abuse scandal caused outrage in April.
The White House denied an allegation in one memo that President Bush had signed a “new executive order” authorising “sleep management”, stress positions, use of dogs, sensory deprivation and “yelling at subjects and prisoners with hoods on their heads”, methods forbidden for FBI agents."
