Maybe.

I think it's more serious than that. He may very well as he says (as I understand it)

- have been planning systematically this for years
- have managed to superficially appear as just another very right-wing person, thereby masking his real intentions
- really think that anyone supporting multiculturalism is a traitor and therefore must be eliminated, and that's just what he methodically did at Utøya.

I don't think he's mad. I think he's very calculating, and I think it could be very dangerous to not take him seriously.

I also think I may very well be wrong.