EM,
"The fact remains that the Oslo crimes need to be treated on their own, the relationship of the perpetrator to far-right European fellow travellers is a legitimate subject for consideration."
I agree.

"Seeking to suck in(to this topic) Islamic jihadist associations is suspect and points, once more, to a decidedly political agenda on the part of Mr Keith of A. "
I think it reasonable to make comparisons.
Many commentators on the day described this attack as having the "hall marks" of Islamic terror, and Breivik consciously aped their terminology.
As Jim says, there is a cause for concern that there may be more attacks by the Far Right.
This was not the first after all.

I do tend to assume that tomorrow's weather will be as forecast.
That does not make it my opinion.
I have neither the knowledge, data or training to provide weather forecasts.
Is that an unusual position?