This question could be argued on both sides and really comes down to your own personal opinion and belief. The use of the graphic novel, comic-strip style format seems very unusual for a story dealing with the topic of the Holocaust. I think the effective nature of the graphic scenes depends on the reader and how they accepted this format. The use of images gives the reader visuals that can then be burned into memory in the more horrifying scenes. However, the use of animals could also be said to soften the blow of such horror to some readers. Images of mice being treated in such a horrible way by cats may be more acceptable to some than having images of Nazis abusing Jewish prisoners.