Exactly this. Whenever I read any of these articles with "book banning" on their titles it simply boils down to parents rightfully organizing and agreeing upon what should be appropriate reading material for their young children in school libraries and classrooms [1]. It's never about "book banning" because after all anyone can get the book from public libraries, bookshops, online retailers, etc. except from the school library in question.
[1]: I don't think it's the case for Atwood's book, however there's a documented common pattern about these "banned" books: Whenever concerned parents try to read them to their school boards, their mics are usually cut off because of the sexual and explicit of the material, which apparently adults cannot be subjected to yet young children should even without the parents' permission. Search for "parents read inappropriate books to school board" to see what I'm talking about.