The future of burning books

Below is the list of the top ten most frequently challenged books of 2009 as gathered from the American Library Association website. I completely understand the low priority some place upon books compared to other forms of media. However, I don't understand why books would need to be burned. Think of it this way, if I had two children, I would probably like one more than the other. That doesn't mean I should burn one (I'll let the sun do that, when I allow my least...