They also have guys who know the system and how to cover their asses. Notice how when he got in trouble this stuff ends up on 60 Minutes II. The investigation starts in Jan. and as it looks bad for him (How could it look any other way with the photos) his Daddy calls Hack.
That does not explain why the photos were taken in the first place and kept in casual control. If Military intelligence ordered this as a method of breaking down prisoners they would have known to keep tight control of something so explosive.
It is possible that the photos are the acts of those soldiers with sadistic leanings and their enablers and were kept for their amusement as mementos in the same way serial killers often take items from their victims and for essentially the same reasons.
The danger of having something so incriminating adds to the spice.
If military intelligence ordered the prisoners to be broken down to get information from them, someone from the intelligence division or other military department should have been on duty 24 hours a day (8 hours shifts), to ensure that it didn't get out of hand or that rules weren't being broken. There should have been someone overseeing all of this, or, there should have been a camera system installed to ensure that abuses were not occurring. In the long-term disciplinary unit at the facility I worked at, there were cameras with microphones all over the place. The only place there wasn't a camera was in the staff bathrooms. I got into trouble once because I told an inmate to "stop being such a pussy."