Phil, it's a scary thought if you think about how many other potential 'Breivik's,' there are out there. Just sitting at computer screens immersing themselves in conspiracy theories and convincing themselves that they are the one to 'make a stand,' against whatever perceived injustice they find. All it takes is for one, slightly unbalanced, person to be told that he has a special reason to feel aggrieved or offended or betrayed. It could take a fairly short time to move from 'slightly unbalanced,' to 'homicidal madman.'
It makes you look at that bloke that just moved into the next flat slightly differently.
Sleep well !