As you probably know by now, there was another mass shooting last weekend, at an outdoor mall in Allen, Texas. Though law enforcement has not identified a motive as of this writing, the killer reportedly wore a patch with the abbreviation for “right wing death squad,” a tribute to the Chilean fascist Augusto Pinochet that’s popular with groups like the Proud Boys. According to The New York Times, investigators are looking at a social media profile they believe belonged to the gunman, which includes praise for Hitler and “hate-filled rants against women and Black people.” There was a time when...