As the world’s most repressive tyranny, the North Korean regime has survived by keeping its people in the dark, dampening their expectations, and instilling a fear of external enemies, especially the United States. Yet that survival strategy was hardly at work during the historic summit in Singapore on Tuesday between North Korean leader Kim Jong-un and President Trump. North Korea’s official media told the nation of 26 million that the talks could bring a “permanent and durable peace mechanism” with the US. TV images showed Mr. Kim touring Singapore, where “every building is stylish,” the streets are clean, and the...