The difference was for most of the victims of the Taliban there was some future and some hope of deliverance with the fall of the regime. Unlike the people in the death camps.

"Quite nasty enough" meant very nasty indeed - but nasty in a different way. This had consequences which were indeed appalling, but were not on the scale which resulted from the form of nastiness that the Nazis demonstrated.

The point being that, even in the case of the Nazis, who were in this sense even worse in what they did, legal process and adherance to the rules about prisoners was seen as possible and necessary.