I agree the Right has a problem in that they have not distanced themselves from the more extremist elements in their midst. This has been and will continue to be a huge problem as large numbers of center right types like myself choose to distance ourselves from what is an increasingly cacophony of nothingness and meaninglessness.
It is also true Breivik’s madness was triggered by that very noise and ugliness.
Nevertheless, the right wing drivel was the trigger only. It served as a platform to launch an already existing psychosis.
If extreme right wing (or left wing or Christian or Jewish or Muslim or Hindu, etc) ideologies could so easily influence hordes of people into committing acts of violence and terror, we would see a lot more of it.
The vast majority of right wing, left wing and all kinds of religious adherents are not violent nor do they condone violence (all political rhetoric aside).
The right wing noise was the delivery vehicle for his already existing insanity.