Sweden has permitted segregation to extend to the point of allowing Islamist and right-wing hate blocs to develop side by side.

I hope they can find a way to integrate the various groups.

For immigrants to make up 20% of the population risks weakening all aspects of a country's cultural heritage — even perhaps the Swedish language. A cultural environment has a certain capacity to absorb people coming from other backgrounds, and it is better not to overload that capacity.