I vaguely remember an article about a month back where I think a girl was killed or something of the sort, and while one Taliban group approved of it, another rejected all responsibility. So clearly the Taliban is not a monolithic group with one central administration. Looking at it that way, there may be different Taliban groups with different understandings, etc. It may be possible to negotiate with some but not with others. I remember one video awhile back where a journalist was filming Taliban in training camps, and some of them were saying they were just there to fight for their homes and families. Clearly not the clerical 'students' (English translation of the Arabic word 'taliban') we normally think of. So clearly the Taliban is no longer, if it ever was, a monolithic group.