the point is valid, but we would be mistaken to think of the taliban as a bunch of ignorant psychotics ... in fact they are master manipulators. after their destruction of the buddhas a few months ago, it rained, which they argued signified divine verification of their action, especially since afghanistan has been in drought. if you recall, they rushed that through over the objections of a good bit of the world. i would be willing to bet serious money that they were informed that the medium-range forecast had a significant chance for rain, so they acted.
these people are not purely fanatics ... they are funded proxies. (imho)