We'll have to wait and see who is right but I wouldn't be surprised if the aid workers are being framed in an attempt to gain a political advantage.
The timing of the arrests coincide too closely with the attacks for me to think this is merely lucky timing for the Taliban.
If the Taliban really wanted to expel them from the country, they could have done so by now. No, I think they want to execute these aid workers that went there to help the Afghan people. I think if they do kill these workers, the backlash by moderate Islamic people will be significant.