Islamic terror is treated by the mainstream media as an incident in a military campaign. Right-wing terror is treated as the actions of a lone madman. So what happens if we treat them both equally?
When the 2010 plot to blow up airplanes over US cities was foiled, talk quickly focused on the men who had tried to execute the attack. Commentators and pundits spent a great deal of time asking how were they 'radicalised'.
In the case of Anders Behring Breivik, our task is made easier by his 1,518-page manifesto, which makes it entirely clear.