With “Midsommar” earning raves and performing well at the box office, horror has never been hotter. And if, as Justin Chang argued in the Los Angeles Times back in 2017, horror has become the defining genre of the Trump presidency, then Stephen King is its patron saint. The master of horror’s many works have seen renewed interest thanks to a slew of successful adaptations, from the box office record-breaker “It,” to its much-hyped follow-up “It: Chapter Two,” and many more projects currently in the works. And while the master of horror certainly is the king of scary set-ups, he says...