Benjamin Franklin once said that whoever gives up freedom for security deserves neither. Sadly out of the fear, anger, pain, and even zeal in the aftermath of September 11th--emotions which I myself felt--many people chose to sacrifice pieces of freedom and others chose to take them all in the name of security. Once that line is crossed, it is very easy to justify anything.
While I do not agree with what happened, I can certainly see how we (in the general sense) have allowed things like this to happen. What do we do now? That's what should be asked and certainly in a context much broader than punitive actions against those who perpetrated and ordered these interrogations. How do we balance personal liberty with security? How do we regain what liberty we lost? Difficult questions to answer.