- the use of sterotypes for woman.
- it didn't create any distinction between witches and people that were "nice".
- it apparently "devalued" the life of a child.
- Witchcraft in the book was taken lightly.
Roald Dahl was critisized in England by feminists for being sexist and witch "groups" in the United States for his negative portrayal of them.
I guess you could say that ultimately it was banned for it's apparent careless treatment of social issues.