Beheading the prisoners kind of appeals to the sadist in me too. But I'd go one step further and follow that urban legend about the Philipping General who took 50 prisoners, killed 49 of them in front of the 50th, stuffed them upside down into a mass grave with barrels of pig intestines (smelly stuff!) and then released the 50th. Supposedly the attacks on friendly troops stopped shortly thereafter.
I never could find any corroboration for that story so it MUST not be true, but it does sound suitably evil and satisfies my personal bloodlust for the creeps in the masks who murder noncombatants (and regular soldiers for that matter) and then slink away rather than face reprisal. Cowards!
Too bad we don't have the balls to stand up to the world condemnation that would surely follow such a merciless act.
Brian