It would seem incredible to think that al qaeda wasn't in the balkans. That would make it one of the few terror-free spots on earth. So why not join forces with the other side?
One doesn't lash out indiscrimately due to religious animus, which in this case is the veneer fostered by Serb agitprop to cover ethnic animosities and hatreds, regarding which the Serbs were the prime perps in fostering in recent history.