I shouldn't bother dignifying this with an answer, but I will. Your stereotype is shared by many North Americans, and it is the result of either being A Muslim whose family is originally from the Balkans, or a Westerner influenced by the wildly successful media propaganda campaign of the 90's, against the Serbs. I think it is more realistic to suggest that they are looking for the return of their holy land, and are willing to fight for it.