If you haven't read Pierce's excellent article, you should. And if you're a Norwegian politician who thinks that you ought to let a domestic terrorist dictate public policy, shame on you. You need only look at the example of the United States to see how well that works.
But above all, they will say, Ignore the fact that there is still a horrible utility in political violence, the way there was during Reconstruction, or during the labor wars of the early twentieth century. If there were not, it wouldn't be so hard to get an abortion in Kansas, and assault weapons would not have been accessories of choice at recent rallies purportedly held to discuss changes in the way the country organizes its health-care system.