" Before advances were made in food storage, he said, Swedish people would have three to four months to harvest a year’s worth of food in the cold climate, so spontaneous dinners have never been a part of the culture. He said Swedish people also want to respect the independence of the family and offering another person’s child a meal could be seen as a critique of the other person’s ability to support a family."
We know why-- Ever try Surstromming? They're probably afraid of killing minors :