North Korea hacked into the computers of a Hollywood studio in 2014, and the company's former executive now blames himself—or his own childhood—for okaying a movie that angered the dictator in Pyongyang, Kim Jong Un. "Curiously, I never really got angry at the North Koreans, on the assumption that if you kick the hornet's nest and get stung, you can't really blame the hornets," the former CEO of Sony Entertainment, Michael Lynton, writes in an excerpt that appeared in the Wall Street Journal of his new book, From Mistakes to Meaning: Owning Your Past So It Doesn't Own You. In...