On a night four years ago, five soldiers back from three months in Iraq went drinking at a Hooters restaurant and a topless bar near Fort Benning, Ga. Before the night was over, one of them, Specialist Richard R. Davis, was dead of at least 33 stab wounds, his body doused with lighter fluid and burned. Two of the group would eventually be convicted of the murder, another pleaded guilty to manslaughter, and the last confessed to concealing the crime. Now some in Hollywood want moviegoers to decide if the killing is emblematic of a war gone bad, part of...