The shooting rampage in Orlando has led to a lot of speculation about Omar Mateen’s politics and state of mind. There's still so much we don't know, but maybe we can learn from another mass murder. Consider the case of Anders Breivik, the gunman who killed 77 people, mostly teenagers, in 2011. It was one of the biggest mass murders in modern history and a national trauma for Norway. Breivik was a white supremacist, so his politics were different from Mateen's. But the two mass muderers were both alienated, self-radicalized loners. And as we struggle to find out what we can from Orlando, maybe there are lessons from the story of another terrorist and another country’s response. So here’s Steve Paulson’s extended conversation with journalist Asne Sierestad, an award-winning Norwegian journalist and war correspondent who covered the Breivik case and wrote the book “One of Us: The Story of Anders Breivik and the Massacre in Norway.”