That guy posted a lenghty manifest claiming his worldview changed firstly in 1999 when NATO (Norway is a member) bombed fellow christians in Serbia, who only defended against muslim invaders of Albania into their traditional province of Kosovo. Remember that both roman catholic Hungarians (ugrofins) and orthodox balkanians (slavs) put the most treasure and bodies to stop muslim invasion into Europe in the late medieval and following periods, when it was most urgent. The westerners usually only watched and have been of token help. Mind you the later wars of Balkan independence in 19th century were just follow-up to that, the Ottoman empire was not able to maintain the ground in continental Europe anymore. That's just to set up some context for these discussions.
Secondly, he mentions 2009 as a point he started hard prep for this very operation. In any case without further information provided it's pointless to speculate was he a part of larger plot, we don't know. Probably most of the island shooting carried exclusively on his own, so the Oslo attacks could have been a solo act as well.
This was relatively rudimental event, no suspension of air defenses for two hours and/or running exactly same terror drills in subway as in other countries, lol. If you compare the death toll per capita in concerned countries it's almost comparable.
Should there follow some radical change in course of the Norweigan politics, be it internal (freedoms) or external (increasingly anti zionist stance) we can start debate some larger picture and who might have been involved.
edit:Hm, watched latest tv news bulletin and they showed parts of his ~1200 pages long manifest, apart from detailed politics there are also step by step "instructables" in various forms how to engage the enemy and diaries building up his particular arsenal, apparently functional as we know now.
So, the eventuality this being an int. level operation to prop up a working terror manual to global audience of billions to create some havoc has passed the test now..
I can't think of better strategy than to make people affraid of each other at close range, irespective of skin, ideology, .. Welcome to the world of "tomorrow" where gun ownerhsip rests only with the neofeudal class again.
Diclaimer for spooks and coppers out there:
I'm not looking to download or operate on the basis of this manual
