you cannot just kill people, even if you are the government. if they're criminals, they need to be arrested and charged with a crime. if they are enemy combatants, it's a war crime to kill survivors clinging to a wreck. (I am not a lawyer but the article quotes several.)
"The Oversteegens and Schaft also killed German soldiers, with Freddie being the first of the girls to kill a soldier by shooting him while riding her bicycle. They also lured soldiers to the woods under the pretense of a romantic overture and then killed them. Oversteegen would approach the soldiers in taverns and bars and ask them to "go for a stroll" in the forest.