If the pictures prove true, we should ensure full prosecution.
Releasing the pictures, though, would be counterproductive. I think the photos could remain classified evidence.
Convict (if necessary), and classify. No need to hand the bad guys propoganda just because we've got a few bad eggs we will control.
They considier their murderers martyrs. We consider our murderers prisoners.
Already done. These are the same pictures taken 2 years ago and used in prosecutions last year.