I went through several of the Geneva Conventions when they pulled that awful stunt with Uday and Qusay. I couldn't find anything in them prohibiting the televising of prisoners. The 1860's convention from the time of the American Civil War has something in it about not 'parading prisoners about', but obviously that was before television. I think the idea was that you don't put prisoners on scary deathmarches.

I agree that it's not appropriate, though.