Norwegian tragedy a symptom of our times?

In a thoughtful piece, Chris Bertram writes: "We may be, now, in ... a world where people select themselves into groups which ramp up their more-or-less internally coherent belief systems into increasingly extreme forms by confirming to one another their perceived “truths” (about Islam, or Obama’s birth certificate, or whatever) and shutting out falsifying information. Put an unstable person or a person with a serious personality disorder into an environment like that and you have a formula for something very nasty happening somewhere, sooner or later. Horribly, that somewhere was Norway last Friday." I fear Bertram is right. This storm too humanity will weather. Unfortunately, the price is likely to be high.