"Our best way out of this mess long term is clearly vaccines," Oliver said at the beginning of Last Week Tonight. "And it's worth remembering we in the U.S. are incredibly fortunate. We currently have access to a lot of vaccines, and more than half of U.S. adults have now gotten at least one dose, which is great. The bad news is some vaccination locations have already gone from having not enough supply to not enough demand." Oliver also took on Tucker Carlson for doubting the vaccine and criticized Rogan for saying (and later taking back) that 21-year-olds shouldn't get vaccinated. "Correlation isn't causation," Oliver said. "The vaccine protects against COVID, not the concept of mortality. It is weird that I have to clarify this but you are, in fact, going to die one day, Mike. Yeah, Mike, stop listening to what Joe Rogan tells you. He's a f*cking moron. And those are his words, not mine."