I'm sure I would have found the article you had a link to interesting--if it had been in English! Unfortunately, I don't read Norwegian, and was unable to find a way to switch it to English. Some sites do give a list of language changing links, but this one apparently doesn't. I even clicked the "Hjelp" link and was unable to find any help on the help page. Typing in a question on how to change it to English didn't help, either. It just called up some unrelated articles that contained some of the words in my sentence.
However, getting back to Brevik, according to your post message, the crowd was deliberately getting his goat by singing a song he didn't like.--COOL! It's non violent, and legal to do so, and he deserves it. He also deserves the death penalty. Do they have that in Norway?
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau