Because radicalized youths that are brainwashed enough that they are willing to blow themselves up are fewer in numbers than radicalized youths that may one day be brainwashed enough to blow themselves up. It&#x27;s a process and it takes some time and I&#x27;m pretty sure plenty of them fail to &#x27;graduate&#x27;. The biggest group that poses serious risk are the ones that have been to the training camps and return to their old home-grounds. The ones that have never left are much lower on the risk scale, and those exist in much larger numbers. Not totally without risk, but nowhere near as bad as the ones that spent months with IS, AQ or whatever other group of idiots there is out there in some trainingcamp where they learn to shoot their AKs and how to set off your bomb vest.<p>Look at it another way: if they <i>could</i> field let&#x27;s say 100&#x27;s of attackers simultaneously, don&#x27;t you think they would? Or do you think they&#x27;d keep them in reserve for the next 10 years possibly being discovered? I can&#x27;t rule it out, obviously, but I think the time between insertion and activation would have to be kept small to avoid losing control of the assets once placed. I&#x27;ll do some reading up on this, it is an interesting question.