A more diluted version of this conspiracy theory is that there is a roughly constant supply of crazies who want to blow stuff up, that most of them are easy to catch, and that on occasion security agencies let one succeed so that they can get favorable-to-them legislation to happen.
No, they are super-human, and all of this is part of an intentional plot to subvert us in a way that won't cause us to rise up and behead the super-humans currently running the show...
