Banned in the USA

Why are books or music banned in the USA? Is this beneficial or detrimental to our society? Go this link. Is there a pattern to why books are banned?

Music and books are mostly banned because of the fear of realization and being exposed to something you shouldn't be exposed to. Nonetheless, the fact that anything is banned from others at all is detrimental to society, unless it is truly inappropriate for a certain age group. Most of the books listed on the website are frequently challenged because of sexuality and offensive language, which I feel really should be censored from children. However, there are books that are listed on the website due to racism and religious viewpoints. I feel that these should not be banned. People, even children, need to be open minded and exposed to the flaws and different perspectives of society.