Why is the Satanic Bible sold in regular book stores? Should it be so public?

I have a satanic bible that I bought in a comic shop, and a book of mormon that I bought in a church sale, and a koran that I bught at a discount book shop, and 3 ot/nt bible versions that I have bought second hand, all on the same shelf as my grimms tales and perraults fairytales , gasp omg the horror of allowing people to buy, read and evaluate what they want.