That's a war anecdote. I'm sure another guy from the same region, that you may or may not have met, can tell you Americans murdered his whole family.
Indeed they are fundamental Islamic, Afghanistan is almost entirely Muslim (99.7%). The reality is the Taliban formed to fight off Soviet encroachment and significantly helped restore order, reduce crime and maintain stability after the invaders were repelled. Though drought stricken was peaceful the 90's, until the Americans showed up, instilled their own defacto government and started blowing cunts up. (it's not the first time they've done that) After 20 years of being killed by US coalition forces there are more members than ever, the war has strengthened their support and position within the region. After generations of being killed if there was not significant local support they would not exist. That alone says a lot about where the people's loyalties lay.
We might not get it, feed on the fear mongering lies (news), and think all is lost for them. They just want us (the US lead coalition) to fuck off.