Anders Behring Breivik could of had a personal vendetta. Far right in Europe is different from the far right in America.
That is why I argue, that in spite of the convenience of the short hand, American conservatism has nothing to do with right-wing politics. The debate between the left and the right is a debate between Marxists. Between socialism on one hand and fascism on the other. And when we accept the enemies vocabulary, out of ignorance, we admit to being one form of Marxist or another.
Both the left and the right have a penchant for infantile extremism because they both spring from the same infantile source.