I think Teribus has it about right. To start with, the guy must have been seriously deranged to perpetrate such an atrocity.

Secondly he appears to be an extreme Nationalist who has been driven over the edge by the policies of the Norwegian govt.
(Please dont try to mis-represent that statement)

As western economies worsen and living standards, pension rights, public services come under further attack,expect to see a backlash against the policies pursued by goverments in Western Europe over the last couple of decades.

Perhaps we may yet see Mr Powells "rivers of blood".....I certainly hope not, but action needs to be taken now to reverse some of the policies which have created the "time bomb"