Dennis Gruending weighs in elegantly here.
My view: if right-wing pundits like Steyn, and Tarrek Fatah, and Pam Geller aren't nuts, then Brevik's actions are sane. If dark-skinned Islamo-fascists really have infiltrated all levels of society--the police, the armed forces, the various political parties, the media, the public school system--then why wouldn't staging some sort of armed revolt be perfectly in order? If "leftists" like those kids on that island, or folks like myself, really are covering up for such terrorists, then isn't a bullet pretty much what we deserve (as indeed Michael Coren suggested)?
Now, of course these "thinkers" are nuts. And, at some level, Mark Steyn (for example) probably realizes he's spooning up boob-bait for the yokels that purchase his books. But I suppose the coin is good. The problem is with readers--like Breivik--who take Steyn's various theories more seriously than he does, and have the "courage" to act from Mr. Steyn's apparent convictions.
Steyn, Fatah, Geller, Coren, Mansur--these people "set the table" for folks like Brevik. That is their measure of responsibility.