[jeltz]

You oversimplify things. While you are to some extent correct I do not think that was the main reason for their surge in the last election. One contributing factor was the bullying from media and the other parties before the election where they were not allowed to participate in debates, all parties declared they would never cooperate with SD, and several newspapers ran anti-SD articles the day of the election. This strategy backfired heavily since everybody loves an underdog, and the faulty idea that if everyone wants someone silenced they must have something important to say.

There are also other factors like that some people genuinely seem to believe that SD has cleaned up their act.

EDIT: I am personally strongly pro-immigration (much more so than any party in Sweden) and I have to disagree about there being much debate about immigration in traditional media. There is a lot in social media though, so I have no idea where all the racists get their idea that they cannot debate immigration issues anywhere.