I was in Iceland recently, and they are quite to the left. They doing fine as well.
And what would be the common factor with Norway and Iceland? Hint: the same factor is at work in Japan, China, indeed most of asia.
Sweden made the rookie mistake of believing their own propaganda. eg diversity makes us stronger. Ironically, Swedish-dominated Minnesota made the same mistake and now has a massive and intractable problem with Somali "refugees."
This is actually kind of an IQ test for progressives, ie the willingness to live by the rules you prescribe for others. You have to be pretty dumb to turn over a pristine country filled with attractive blond women to arabs and Africans, but Sweden did it. Now they suffer the consequences, which in the end will be the end of their culture.