Seriously, if Ender's game is considered pornographic, then we could just as well ban the bible from schools, for containing the Song of Solomon.
No need to get that far into it. The first book has both attempted and carried-out gang rapes, as well as incest, sex slavery, seduction, and drugs.
The problem here is that the Bible Belt is full of these "brimstone sniffers" who are so afraid of their own sexuality that they attempt to snuff it out in their children and everybody else, and think they're doing the work of God when in fact they're making his name a laughingstock. And South Carolina is the buckle of the Bible Belt.