Dan Nickname Beshers said:
Again, it's not just about lazy parents. It is more - far more - about people who truly believe that they have the right or even responsibility to force the world to match their moral code. These people sometimes term themselves crusaders; I couldn't agree more.
Well, keep in mind as well that these people are not limited to the left or the right.
Right wing crusaders want to prevent kids from reading about "witchcraft" and try to ban Harry Potter. They want to prevent kids from learning about evolution, and want to make sure schools don't teach that being gay is normal.
Left wing crusaders want to protect kids from violence, sexism and racism and therefore want to make sure the kids can't read the "n" word in Huckleberry Finn or watch Bugs Bunny drop an anvil on Daffy Duck's head.
It's still censorship no matter what direction it's coming from.