Tbh, it’s not a fairy tale but an illustrated children’s book written in 1845 by Heinrich Hoffman for his three year old kid. It was one of the first illustrated books, so it is considered to be one of the first comic books. Each story has a morale but is way over the top.
Interestingly a lot of the descibed behavior is known to be with ADHD or anorexia, today.
Growing up in Germany I always find Struwelpeter a quite horrible book (yes, I too had it a kid).