For those who want to write off the Norway attacks as the work of a mentally ill individual with no connection to ideology:

“This may be the act of a lone, mad, paranoid individual,” said Hajo Funke, a political scientist at the Free University in Berlin who studies rightist extremism, referring to the right-wing fundamentalist Christian charged in connection with the killings, “but the far-right milieu creates an atmosphere that can lead such people down that path of violence.”

Best summary of the dyanamic I’ve seen so far.