Why does Liesel tear up a book in Ilsa Hermann's library?

Liesel is pretty frustrated at this point. She thinks of poor Max marching to Dachau. She thinks of Alex Steiner, and she thinks of her dead brother. At the centre of all this Liesel sees Hitler spewing his words of hate and distraction, words that have the power to destroy. This is when she starts tearing the book up in the library. It is symbolic of Liesel's love/hate relationship with the written word.