I have some interesting input on this issue. Back in the early 2000s, I had been corresponding with Gary Mack after he became the curator of the museum about the lack of balance in the museum's bookstore. I noted that some of the best scholarly pro-conspiracy books were not sold at the bookstore. I also noted that Posner's atrocious Case Closed was prominently displayed for sale, but that none of the scholarly refutations of the book were offered. Well, about a week later, Mack accidentally sent me an e-mail that he intended to send to one of the senior folks at the museum. He addressed him by his first name (I don't recall the name), and his comments indicated that the recipient was one of his superiors. In essence, Mack said that if enough people raised a stink about the bookstore's one-sided inventory, the museum might have to address the issue.