The extremists of all flags, whether they laughably describe themselves as Christians, Muslims, nationalists, or what they will, have far more in common with each other than with those they claim to represent. They can hate and kill who they choose because they cannot or will not identify with them as people. This is not fighting for a cause, this is failure of humanity; self-involvement on a horrific scale.
You have to wonder about their mental processes. What does a man think he will achieve by murdering cold-bloodedly? Did he seriously believe that Norway could be terrorised out of allowing immigration? Maybe he thought he could spark a nationalistic uprising by the heroic shooting dead of teenagers.
It seems he wrote a 1,500 page document to explain his actions, but I doubt it will tell us anything – except the incredible lengths an insecure man will go to, to justify himself.