MSNBC host Joy Reid delivered a monologue on Monday blaming Tucker Carlson for the so-called "Great Replacement Theory" that the Buffalo, N.Y. shooter allegedly wrote about before committing multiple murders at a grocery store. "No singular voice in right-wing media has done more to elevate this racist conspiracy theory than Tucker, who even with a new head writer, spends night after primetime night injecting the rot from the dregs of the internet directly into the veins of Republican voters," Reid said. "Are Tucker's writers sourcing his show from for 4chan?" Reid asked. "These are just questions. As 'The New York Times' analysis last month found, in more than 400 episodes, Tuckums has amplified the idea that a cabal of elites want to force demographic change through immigration. That is replacement theory!" "Which brings me back to where we started," Reid said. "The reality is Tucker is not some deep thinker. He's channeling the gross stuff his viewers could easily find online and then feeding it to republican voters and Republican politicians as infotainment. And that feedback loop has terrifying reach. That murderous low life in Buffalo wouldn't even have to listen to Tucker. He wouldn't have to watch him at all to get it if they are essentially pulling from the same source material."