What Pizzagate has in common with every conspiracy theory

On Sunday afternoon, a man named Edgar Welch walked into the Comet Ping Pong pizzeria with an AR-15 rifle, firing at least one shot and surrendering only when he was satisfied that no children were being held captive on the premises. It was the result of a bizarre theory that has circulated on right-wing conspiracy sites for more than a year, alleging that the site was part of a pedophilia ring implicating top aides to Hillary Clinton. No evidence for the scheme has ever been produced, but it ha