why did liesel destroy the book in Isle Hermann's library?

In a momentary fit of anger, Liesel blames words for the plight of her friends. she contemplates all the people she has seen die and pictures Hitler's words at the center of it. She does not want to hope for Max and Alex Steiner anymore, "because the world does not deserve them." She rips up the book she was reading and says out loud, "What good are the words?" "Without words, the Fuhrer was nothing." She calls out Ilsa's name, but gets no response. Liesel writes a letter to Ilsa, in which she apologizes for destroying a book and says she will never return to punish herself.