"The investigations over the tapes frustrate some C.I.A. veterans, who say they believe that the agency is being unfairly blamed for policies of coercive interrogation approved at the top of the Bush administration and by some Congressional leaders. Intelligence officers are divided over the use of such methods as waterboarding. Some say the methods helped get information that prevented terrorist attacks. Others, like John C. Gannon, a former C.I.A. deputy director, say it was a tragic mistake for the administration to approve such methods.
Mr. Gannon said he thought the tapes became such an issue because they would have settled the legal debate over the harsh methods.

'To a spectator it would look like torture,' he said. 'And torture is wrong.'"

If you read "The Dark Side" you can get a sense of what they may've seen on these tapes - complete humiliation and abuse of the detainee.  Example:

JANE MAYER: Well, obviously there are a lot of psychologists who are very defensive about this role, and there's a reason why. Starting in the summer of 2002, there were psychologists from the SERE program going down to Guantanamo and supervising and advising on the interrogations there, which included the interrogation of Mohammed Qahtani, the so-called twentieth hijacker, who was put through the most unbelievable program of psychological abuse. I don't really know how anybody could defend it. Some of the transcripts have come out.

He was subjected to fifty-four days of only four hours of sleep a night. He had bags of fluid put into his veins, so that he had to urgently go to the bathroom; they wouldn't let him get up and go, so he had to urinate on himself. They put, you know, the bra on his head. They made him do dog tricks. They put a birthday hat on his head and sang "God Bless America" to him. I mean, looking at the--they told him to bark like a dog. They told him that he was lower than a dog. I mean, it goes on and on and on. People have to see these transcripts to believe it.

Who watched these tapes and thought this could possibly comply with domestic & international law?

The most cdommon comment I heard at the time was, "Why didn't he destroy those tapes?!?"