In this episode, Cathy O’Neil, the author of “Weapons of Math Destruction,” takes a break from a bluegrass jam session to explain how the national crisis of bad algorithms affects us all. David Axelrod, Barack Obama’s former campaign strategist, discusses Clinton and Trump, and muses about the Chicago Cubs’ shot at the World Series. And the “Black-ish” creator Kenya Barris recounts a family trip to Disneyland that he just had to write into his show.