John Oliver took a poke at the anti-vaccine movement on Last Week Tonight. He argued that people seem to forget how well vaccines work, because people don’t bother posting Facebook updates like, “I didn’t get polio again today!” Now, while the vast majority of parents are making sure that their children get vaccinated on time, anti-vaxxers are getting louder — spurred on, in part, by President Trump — and the result is confusing parents. According to Oliver, some parents are asking questions like, should you vaccinate?