First of all, the ACLU defends freedom of expression, not the content of expression. Any involvement by the government in deciding which ideas are fit for public consumption robs you of your constitutional right to make that decision for yourself. J.R.R. Tolkien's The Hobbit has been accused of promoting Satanism, and Alice Walker's The Color Purple has been charged with undermining family values. Nudity is being edited out of films by cable television stations, paintings of nudes are being excluded from art exhibits and theatrical works that include nudity have been banned, or altered, in localities around the country. Artists are feeling pressure from government funding agencies to steer clear of art that deals with issues of gender and sexuality.
Censorship is an infectious disease.
The creative spirit must be free. When it is not, society suffers.