Pepe the green frog meme’s unmitigated rise into pop culture comes amid hysteria that the internet cartoon is little more than a stand-in for white nationalism. But it turns out the original story that prompted the panic is more or less a complete troll job. The Daily Beast’s Olivia Nuzzi wrote a piece in May striving to describe and trace the genesis of Pepe in the alt-right scene, a nascent, illiberal political movement focused on preserving white identity and Western civilization. In the process, Nuzzi just ended up repeating various made-up stories from the only two people she interviewed from...