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As a parent myself, I can understand why parents would want to screen their children's reading materials. And certainly, if a parent finds something they perceive as "questionable," they have the right as a parent to keep their own child away from it. HOWEVER, I don't think it's fair for a parent to make that kind of decision for other people's children. That's where I have to draw the line.
There's lots of information out there on Banned Books Week. Here are a couple of web sites (and there are more out there):