JonnyB
Workaholic
Because one of the founding principles of the DK (the party which is advocating this book-burning) is atheism, out of which this impulse is born.
But that doesn't mean it's the driving force in everything they do. They can have other beliefs and agendas as well. If they haven't brought atheism into this issue it may be because this isn't about atheism.
Though I will concede that it would have factored into their decision to burn Hindu scriptures as a from of protest.