The surprising downsides of empathy

n CBeebies, the BBC service for little children, there’s a programme called Treasure Champs, which aims to teach young viewers about their feelings, and how to manage them. In one episode, the character Barry – a blue rectangle with pink eyebrows – is glum about the result of his football match.

“We lost,” says Barry.

“It doesn’t matter!” says Kari.

“It was my fault. I let all the goals in.”

“I don’t understand why you’re so sad. Just forget about it.”

“I can’t.”

“Why not? It’s just a game.”

“You’re...