Per capita rate is surprising!

Norway: 5.4 million - 0.03 people per million each year.
Finland: 5.5 million - 0.06 people per million each year.
Yanks : 320 million - 2.5 people per million each year.
Iceland: 371,000 - Only one person ever.

Norway: Immigration, or multiculturalism/cultural conflict.

The only real stand-out is Anders Brevik, and that's strange to say the least: he's mentally sane, yet sane people don't write 550 page manifestos. He did. Sane people don't see taking drugs as an aid to accurately aiming a rifle. He did. Sane people don't solve dislikes of an organisation by aiming at it's junior members, when the heads are within reach. He did. Sane people don't target a political party by bombing the general public service. He did.

Finland: Harder to pin down causes (if someone from Finland could help with this?).

Iceland: a man in his late 50s, was said to have been firing a shotgun inside his apartment and out of the windows in east Reykjavik. Repeated attempts to calm him, in addition to a tear gas canister lobbed into his room, had been unsuccessful. Two police were injured. Guns everywhere, yet only to those who pass a medical and written test: firearms owners are part of the nation's defence. It seems an amazingly simple formula - those who can keep themselves physically fit are not likely to be on drugs/psychiatric medications, into seances or video games. Comparisons with Canada and New Zealand.

Iceland has a low crime rate - a product of its large, stable middle class. There are almost no distinctions, the tycoon's children go to school with everyone else's children (this is not a product of Marxism), and pro-active policing: pre-empting crime issues before they fester, or stopping issues at the nascent stages before they can get worse.

Obviously unfinished but I have to go