corythatwas No, of course it’s problematic but it’s meant to be problematic. We see it through the eyes of the German characters because it makes the ending more shocking. It’s a story about the German adults realising and coming to terms with what they've allowed their Society to become, by virtue of their own ambition (in the case of the father) or by doing nothing (in the case of the mother).
The Jewish characters aren’t fully fleshed out (in my opinion) because we know that story and we know It’s hideous, evil and devastating. Because the details of the holocaust are so well known the author needs to go elsewhere to make us sit up and take notice. He achieves that. The ending makes you rethink everything about the Holocaust. Of course it’s simplified, it’s for kids and of course it has its issues, I’m not saying that I think it’s the finest piece of work from a literary or historical POV, but it gets young people thinking and talking about this period of history.
And whilst Bruno isn’t a member of the Hitler Youth, his sister is and the author does a very good job of showing how she thinks about the people in the camp (she says that they aren’t real people, which confuses Bruno no end) so it doesn’t pretend like the German people were clueless, it’s just Bruno who is. That may well be unrealistic for a child of his age- I don’t know, I’ve got literature degrees, not history ones- but he has to be innocent to the facts for the fable to work.
For what it’s worth there were members of my ancestors lost in those camps, I’ve been to Auschwitz and seen what remains with my own eyes and that’s why I think that anything that starts a conversation about the holocaust with children is a good thing.