Quoted for truth.
But yeah, the religious factor and the self censorship are two of many problems. To be honest, the parents are a major reason why the system isn't as great as it could be. Stupid parents try to perpetuate stupid students.
If you want to know what books are trying to be withheld from students by stupid parents, here is the wikipedia article with data from 1990-1999, so a bit out of date, but not really since I doubt these long controversial books are suddenly ok.
http://en.wikipedia.org/wiki/List_of...oks_in_the_U.S.
EDIT: Actually, here is the ala.org website that tabulates the most challenged books list. Here is the direct link and on the left you can click on each individual year and by the decade.
http://www.ala.org/ala/issuesadvocac...nged/index.cfm
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