John Oliver used Last Week Tonight's first show back after a three-week hiatus to talk about the flood of dangerous conspiracy theories that have sprung up around the virus.Oliver took time to walk through some popular conspiracy theories — the JFK assassination, Princess Diana's death — as a way of explaining why and how people end up believing these things. "They help explain a chaotic, uncertain world and appeal to the human impulse to what's called proportionality bias," he said, before expressing his outrage toward some of the loudest coronavirus conspiracy theorists.