On American Thought Leaders, Jan Jekielek spoke with North Korean defector Yeonmi Park, author of “In Order to Live: A North Korean Girl’s Journey to Freedom.” They discussed the North Korean regime’s tactics of oppression, the parallels between her experiences in North Korea and what she now sees in the United States, and the “suicide of Western civilization.” Mr. Jekielek: Your book is honestly one of the best books I’ve ever read. It can help people understand what it’s like to live under a dictatorship. Ms. Park: The first thing my mom taught me was, “Watch out what you say,” like even the birds and mice could hear my whisper. She said, “The most dangerous thing you have in your body is your tongue.” That was the only way that she knew how to protect me. So in a way, in North Korea, even thinking isn’t free. A thought crime is a real thing. …