If you’ve spent time on the Trump-supporting parts of social media, you’ve probably come across a strange meme in the past couple of years. MAGA-loving Twitter is constantly offering people “free helicopter rides.” But what does it mean? The offer of “free helicopter rides” is a reference to the practice of killing people by dropping them from helicopters, made most famous by Chilean dictator Augusto Pinochet in the 1970s. Sometimes Pinochet’s “death flights” were conducted over the ocean, but they were also done over rivers and sometimes the land. Hundreds of political dissidents are still unaccounted for from the Pinochet...