Some experts say that Al Qaida has already lost so much from it's core staff and leadership that it has become more of an ideology than a real organization. In the end it hardly matters if a person residing in a Western country and wanting to perform a terrorist attack has ever even spoken face to face with a real islamist. It's enough the person has read and heard enough of the radical movement to want to be a part of it, or even just to use it as an excuse. After all, the end result is no different: The person will execute a villainous act, likely dying or getting captured during it or shortly after. It's not like some firebrand preacher having wasted his time blathering about paradise and a score of virgins in afterlife to the candidate would make any difference when the bomb is set off. And that's all the terrorist organizations would ask of these youths: that they kill as many enemies as possible, sacrificing themselves in the process. It doesn't require years of training and conditioning in some backwards country out there.