Why is the book Through the Looking Glass banned?

Answer 1

There is no evidence to suggest that Through the Looking Glass is banned.

There are claims that the first book, Alice's Adventures in Wonderland has been banned in the past.

Banned Books Week: September 25--October 2. University of California, San Diego Social Sciences & Humanities Library website says:

Alice's Adventures in Wonderland
Lewis Carroll
1900
Suspended from classroom use, pending review, at the Woodsville High School in Haverhill, New Hampshire, because the novel contains expletives, references to masturbation and sexual fantasies, and derogatory characterizations of a teachers and of religious ceremonies.
1931
Banned by the Chinese Governor of Hunan Province on the ground that "Animals should not use human language, and that it was disastrous to put animals and human beings on the same level."

However, as they don't provide a source for this information, it is impossible to verify.

The File Room, a website dedicated to the cataloging of banned literature, repeats the claim about the book being banned in Hunan Province and cites its source as Banned Books 387 B.C. to 1978 A.D., by Anne Lyon Haight, and Chandler B. Grannis, R.R. Bowker Co, 1978. (See Related Link below) This appears to be the origin of claims that the book was banned in China, but corroborative evidence remains elusive.

Answer 2

The book "Through the Looking-Glass" by Lewis Carroll has been challenged and banned in some places due to its portrayal of certain characters and whimsical, nonsensical nature. Some critics argue that it promotes drug culture and contains disturbing themes. Overall, the reasons for its banning vary but often stem from concerns about its content being inappropriate for children.