It is not the black-and-white attack upon innocents that you seem to have in mind. It was a calculated act of resistance to total demographic warfare that has long been perpetrated by Communists upon the Norweigian people.
No such motives --- not a syllable of this --- could justify the murder of those kids. It is a massacre of unarmed noncombatants and nothing more.
There is a widespread idea that practically pervades our post-Christian, post-Western-Civilization society, Right and Left: the idea that there is no act in the world that can be called inherently and intrinsically evil, but any act can be called just if by it you intend to gain a great enough good. This moral theory is called "Consequentialism." It's a rejection of the whole heritage of the Christian West which Breivik claimed to defend, a wholesale negation fof both Faith and Reason, Grace and Law.
This Consequentialism, this refusal to distinguish between Good and Evil in means as well as in ends, will destroy us --- is destroying us internally --- far more savagely than any external jihad ever could. Its origin is in Hell, and so is its destination.