A lot of people don't believe books should be used to educate, as in to expand a child's understandings or beliefs. They think that books are there to convey information, develop reading skills, or teach morals. That's the way it seems to me when people talk about banning books, though they may not phrase it like this. They don't want their children reading anything that describes alternative behavior unless it is obviously portrayed as bad. They don't want other people's children reading these books either, because they think it will lead to negative behaviors in their communities. They don't understand that children are going to be exposed to alternative ideas eventually and that the better choice, at least in my mind, is to prepare children for these exposures.