There is no cause to doubt that the US killed Linda Norgrove accidentally. My sorrow for her and her family is the same as that I feel for the thousands of entirely innocent Afghan and Pakistani civilians killed in US airstrikes.
Nor do I diminsih the responsibility of her captors. But nonetheless, the most worrying point of thw whole incident is the lie propagated by NATO that she was killed by a suicide vest wearing captor.
The suicide vest is of course a potent symbol of Islamic fundamentalist violence, and by invoking it NATO were not only lying about who killed Norgrove, they were reinforcing the image of her captors as religious fanatics, as opposed to local tribesmen.
Most of the Afghan resistance consists of locals motivated by ethnic and cultural factors defending their own soil. The characterisation of them all as Taliban is a bit of propaganda bought wholesale by the media. These may have been local partisans, or just ransom seekers. They may have been hiding a motivation behind a religious facade. There is no evidence I am aware of that the hostage takers wished to die themselves. That is why the “Linda Norgrove killed by suicide vest” lie is key.
So it is very important that an inquiry establishes not just the truth about who killed Linda Norgrove, but whether there was a suicide vest at all anywhere in the incident. Fabric is seldom destroyed by explosion, rather shredded and partially burnt. If the suicide vest is a complete invention, that would be an outrageous lie by NATO.