Shin said they would have to pay the price for his mistakes - he could not entrap others.
His wife sounds like an excellent human being. The world is a lesser place with her anonymous death in some communist death camp for being a good person, with more courage than any of the people responsible for killing her.
Oh Kil-nam damned himself with his ideological beliefs. According to the article, he got a "PhD in Germany on a Marxist economist". He knew better. He knew the inherent nature of Marxist countries, because economics are the foundation of EVERY country.
I have sympathy for his wife and kids. I like to think he would have sacrificed himself for them if he could. Realistically, there's no way the NK government would allow that. Yes, I know, who knows. The only way he can redeem himself TO himself is to educate as many people as possible about the realities of authoritarian governments, communist governments and North Korea in particular. His ideology put his wife and kids voluntarily in a death camp. No one knows if his ideology put anyone ELSE in one of those camps. He'll never pay off that moral debt. But if he is even remotely human, he will spend the rest of his life trying to make even a token payment.