Even though it’s a fictional, animated depiction of what happened near the end of the WW2 it’s depicting something that actually happened. I don’t think there’s going to be any problems in regards to separating fiction from reality with this movie.
If anything, the movie is tame in comparison to the actual, real-world devastation of nuclear war.
Woah there! German fairy tales were meant for children! That’s explicitly their target audience.
The whole point was to scare the children into behaving a certain way. Like, “don’t go wandering off alone. Bad things can happen!”
If you just tell your kid that they won’t listen. However, if you tell them a story about how kids that wandered off alone into a forest got cooked and eaten by a witch then maybe they’ll stick to the village (and be wary of strangers).