SANTA ANA, CA—When local man Ralph Dunkley found himself in the midst of a three-hour-long wait for a two-minute service at his local DMV office, he decided to redeem the time by pulling out his iPad and carefully pecking out a 5,000-word blog post arguing in favor of a government-run healthcare system in the U.S. “America is way behind the rest of the civilized world—we need universal healthcare and NOW,” Dunkley typed as dozens of people around him moaned in agony while waiting in their seemingly never-ending DMV purgatory. “The United States government has more than proven its capability of...