Labeling Breivik as a Christian fundamentalist serves a political need, but if we really have to attribute to a religion what he did, he was more like a pagan fundamentalist ("Odinist") who expressed his belief that Jesus was "pathetic".
Edit: However I agree with the part that this is never going to go away (completely). You cannot totally prevent terror, and living in a society that could would be terror itself.
I don't think so.
Even if you exclude international politics completely the number still isn't zero. Take the 2011 Norway attacks where 77 people died. That was one guy, a Christian fundamentalist, likely paranoid schizophrenic who wanted to rid the world of Marxism/feminism/islam/something. Then you have the unabomber, most school shootings, and so on which you can point to.
My point is: This stuff is NEVER going away. All you can do is minimise it. Zero is certainly a laudable goal but likely an unachievable one.