This summer, as last, Dylan Hernandez, 17, noticed a theme on the social media accounts of fellow students at his private Catholic high school in Flint, Mich.
“An awfully large percentage of my friends — skewing towards the affluent — are taking ‘mission trips’ to Central America and Africa,” he wrote to me in a recent email. He knows this from pictures they post on Snapchat and Instagram, typically showing one of them “with some poor brown child aged 2 to 6 on their knee,” he explained. The captions tend to say something along the lines of, “This cutie made it so hard to leave.”