Open Borders writes up that World Values Survey on the attitudes of people in 48 countries toward immigration policy:
Several countries in Eastern Europe and Latin America also seem to have more open borders supporters than any of the rich countries, except Sweden, which appears to be an outlier, with a far more pro-open borders populace of any rich country included in the survey.
My hunch is that over time, the Swedes have become ethnocentric about their political correctness. Being true believers in stupid stuff is how they show that Swedes are superior to the other Nordics, those virtually subhuman vermin. "We're Swedes, we're not like those horrible racist Danes, who have been so insensitive as to try to crack down on arranged cousin marriages of young Pakistani girls for the purposes of immigration fraud!"