'1982 : After years of appeals, the Supreme Court ruled, in Board of Education vs. Pico, that "local school boards may not remove books from school library shelves simply because they dislike the ideas contained in those books and seek by their removal to prescribe what shall be orthodox in politics, nationalism, religion or other matters of opinion." The case was brought by students opposing a directive made by the Island Trees School District in Levittown, N.Y. ordering the removal of books considered "anti-American, anti-Christian, anti-Semitic, and just plain filthy" from school libraries.'
From the 'Timeline of Immorality'.
The site itself is just another Christian site, but calling the refusal to destroy books that don't agree with you as 'Immoral' is more than a bit steep.