In order not to insult anybody's religion or politics (or earn the ire of people with a known tendency to blow up people they don't like), the terrorists in action movies are not only mostly white guys, they represent no organisation, movement, religious sect or political tendency known to the real world. Even if they are identified with a real organisation (the IRA, the Russian Mafia, Basque separatists, somebody white but terroristic), they will be described as a "Rogue Faction", not the parent organisation. In many cases, they actually represent no identifiable cause at all, beyond making things go BOOM.