I have an article at OpenDemocracy on Breivik and the Norwegian immigration debate:
What really happened in Norway after the July 22 attacks was not a witch hunt, but something more subtle: an attempt by the traditional holders of the moral high ground to use slippery slope arguments and guilt by association to discredit moderate versions of Breivik’s ideas.
This has been met with only mixed success. It has been successful, in the sense that these arguments have been formulated, and are taken seriously by those who never liked immigration-skeptical ideas in the first place.
It has been unsuccessful in the sense that it has persuaded nobody else.