Perhaps some books are banned because folks would be disturbed by the arguments made. Caste is such a book. The author draws heavily on historical documents in making her case and it is such content and logic that scholars would take on in trying to make other arguments. For some, the task of mounting such challenges is too demanding and the weaker approach is to try to block such positions from reaching the ears and eyes of those looking for facts. The history of this country makes a good case that the use of religion was involved in creating and defending a caste system. This is one of those facts some simply don’t have a way to defend so they would rather each of us not be challenged with this reality.