I won't mourn the Taliban, any more than I'll mourn the troops that die in this mindlessly stupid "war", but I'm not happy when they die. I'm not even convinced they were notably unpleasant in the general scheme of things.
The whole thing is a tragic fuck-up as far as I'm concerned, caused precisely by the sort of world view that can write "The more of them we kill the happier I will be, and the better a place the world will be".