Sgt. Frederick, in an email home before the waste material hit the air-moving equipment, doesn’t sound at all like someone trying to hide sadistic excesses of which he was ashamed.
(Note: the antecedent of “they” and “them” apparently switches back and forth between the interrogators and the prisoners.)
It is very interesting to watch them interrogate these people. I have made some really close friends. They usually don’t allow others to watch them interrogate but since htey like the way I run the prison they make an exception. We have a special housing unit where they house the inmates that they interrogte. We have had a close bond with them since we help gettting them to talk with the way we handle them. We have had a very high rate with our style of getting them to break.They usually end up breaking within hours.