A letter in today's Guardian says what a lot of people are thinking:

"Mr Blair tells us the filming of US prisoners is the sort of thing that makes it necessary to get rid of Saddam. Presumably he would have had no objection if the Iraqis had dressed them in orange suits, hooded and shackled them, and wheeled them between interrogation centres on hospital trolleys."

And here is an article by George Monbiot in the same edition, making the same point at greater length: http://www.guardian.co.uk/comment/story/0,3604,921192,00.html -"Suddenly, the government of the United States has discovered the virtues of international law."