Evidence that Taliban is made up of illiterate low functioning killers
What is the rationale for killing people trying to save the lives of your people? There is none that makes sense. Taliban leaders are the ultimate control freaks and they do not want anyone feeling any gratitude toward someone who is not also a member of the Taliban and would rather see people die than have that happen.
There was no immediate claim of responsibility in the killings of six workers, but Taliban insurgents have vowed to target them.