Apparently it was all the fault of Right-wing bloggers and Right-wingness generally. We know this because an important, symbolic, portentous cartoon by Martin Rowson tells us (Or not: see note below) so in the Guardian. And so does the New York Times.

More broadly, the mass killings in Norway, with their echo of the 1995 bombing of the federal building in Oklahoma City by an antigovernment militant, have focused new attention around the world on the subculture of anti-Muslim bloggers and right-wing activists and renewed a debate over the focus of counterterrorism efforts.