They're that bad. From the Hill:
President Obama reversed his previous decision to release photos showing possible detainee abuse in Iraq and Afghanistan after growing concerned that the pictures would endanger American troops, press secretary Robert Gibbs said today....The logic is a bit Bushian. The photos don't add anything new to our understanding of the crime, but they're so bad that they'll incite violence against our troops? Uh huh. Yes, because actually witnessing a crime in progress does nothing to shed light on the crime itself. Sure.
Today, Gibbs said that the President had not seen the photos in April when he made the original decision. Now he has.
"The president believes that the existence of the photos themselves doesn't actually add to the understanding that detainee abuse happened," Gibbs said, adding that the Pentagon is already reviewing interrogation practices for wrongdoing.