My suspicion is that it's due to a number of factors. Economic equality (real or perceived) is probably one thing; cultural homogeneity is probably another; if

My suspicion is that it's due to a number of factors. Economic equality (real or perceived) is probably one thing; cultural homogeneity is probably another; if I infer correctly from the article that Icelanders see dealing with crime as a matter for all citizens, not just agents of the state, then that probably is as well.