During cross-examination, prosecutors tried to tease out exactly when Breivik was radicalised and what the catalyst had been. His answers produced a confusing picture of a teenager who once "had a best friend who was a Muslim". He said he awoke to the threat of multiculturalism when immersed in Oslo's hip-hop scene and after being attacked by "Muslims" (he claimed a gang broke his nose – a claim the prosecution may test with an x-ray) and became the "ultra-nationalist" he considers himself today. Like many who came of age in the late 1990s, much of Breivik's education came via the internet. He admitted he had relied extensively on Wikipedia to produce the 1,801-page "compendium" setting out his manifesto before the attacks last year.
He read the English media, misconstruing a Times article from February 2010 to claim that the newspaper reported that a survey had found "3/5 Englishmen believe that the UK has turned into a dysfunctional society as a result of multiculturalism".
He noted that "Sarkozy, Merkel and Cameron have all said that multiculturalism has failed". He had studied recent history and was disgusted to see what happens "any time nationalist parties take power". He cited as examples the partial EU boycott after Jörg Haider's far-right Freedom party entered Austria's government in 2000, and the rightwing coalition in Hungary, which he claimed, was under pressure to "change their mind by being called intolerant nationalist Nazis".