They already tried back in April
The results weren't what they were hoping for:
The Italian hostage killed by kidnappers in Iraq was a defiant "hero" in his final moments, Italian Foreign Minister Franco Frattini says. The dead man was identified as Fabrizio Quattrocchi, 36, a security guard.
As the gunman's pistol was pointing at him the hostage "tried to take off his hood and shouted: 'now I'll show you how an Italian dies,'" he said.
The article also says, Al-Jazeera also said it had video footage of Mr Quattrocchi's death, but would not broadcast it, because it was "too gruesome".
More likely, they didn't show it because it showed a brave man refusing to cower before his murderers.