Read some of the banned books on the list.
Some parents objected to the book sexual contents, other parents and adults object because the books are LGBTI friendly.
In a world that we need to teach children diversity and respect, parents are teaching children the opposite because of their religious or personal bigotry.
Following up reading.
Don’t Take the Freedom to Read for Granted
Seriously. I lived in a place where people crossed border just to buy banned books. So don't ever take that for granted.