I thought that as well, when I this first happened, and the Manifesto was out there (as in, essentially as it was happening). Now, I am not so sure. Nothing he has shown since then has been a sign of any great intelligence. Quite the opposite, actually. He clearly thinks he's some kind of genius, though. He's probably not outright stupid, but I don't think you have to be that intelligent to pull this off. Just immensely determined and focused (and devoid of a conscience). He was nearly caught several times. Essentially, the reason this worked is because nothing remotely like it has ever happened in Norway. He left lots of clues, in retrospect.