I totally agree, and it doesn't even work- marginal books that would go unnoticed get banned by a library system and become best sellers
Mark Twain to his editor on the Concord Public Library banning The Adventures of Huckleberry Finn in 1885:
“Apparently, the Concord library has condemned Huck as ‘trash and only suitable for the slums.’ This will sell us another twenty-five thousand copies for sure!”