I stand corrected on Breivik; I thought he had been picking people off at random but upon further review the camp where he killed 69 was an operation of the Labour Party, so yes that would count as an agenda. And that was after he bombed some government buildings in Oslo, for which he's less remembered.
Sure that's crazy, but the fact that they (not we) thought of it as a way to get their agendas effected, that makes it terrorism-- the purpose.
I've heard that said, that somehow he picked the children's camp on that island (I've looked up the island on Google Maps, very dramatic) as a political thing, but ......what?
I've seen pictures of the children, they were early teens, mostly blond Norweigians like Breivik, it just makes no SENSE.
Nope, I'm hanging in there with crazy. Breivik was no doubt angry about Muslim invasion of Norway, and I don't like Muslim invasion of America, either, but he was just crazy as a hoot owl. Killing a blond children's camp isn't going to stop Muslim immigrations, and nobody sane could possibly think it would.
There are violent group conspiracies to make political changes on the one hand, and then there are violent criminals more or less insane, who really just want to kill, kill, kill, blood, gore, veins in their teeth, not well men. I'm not interested in whether the latter had a political thought in their tiny, shrunken, impaired brains.
We should concentrate on the effective group conspiracies, religious or political. Including any that try to push crazies over the edge one by one, like that American imam in Yemen was doing, with some effect.
I don't know what we can do about the crazies, probably nothing until there are more mental hospitals built to lock them up in when they tell their violent plans to someone beforehand. That's what people used to do with homicidal maniacs and it was a good idea.