who's to say they weren't ordered to do so? every major country in the world uses PSYOPS and other such tactics to inflict maximum psychological influence in the quickest time.
quick example.. our own country (police) does the old, turn on the A/C full blast, good cop bad cop routine during in-house investigations. why? because it is simplistically effective.
we all know there are the "silent orders". ie go kick joes ass in his room instead of Article-15's. or smoking someone until they are a borderline heat casualty to get the point through off the record. i don't blame the soldiers one bit regarding these "abuses". it's the nature of the investigative beast.
to get timely info from an enemy who is unwilly to give up OPSEC,you gotta bend the rules. and for every situation like this there has to be a "Fall Guy". conviently they found theirs in the photos.
in closing, by all means, if and when i ever become a POW, stack me butt ass naked, dog collar and all, on top of all creation, as long as i come home alive. humiliation would be the least of my concern.
*take grammatical correctness, context, content, etc. into consideration as i am shit-housed at time of posting