A. The stories are not fairy tales, they are just stories collected from informants.
B. So many aren't even German. Most were gathered from young French refugee women who remembered hearing them from their Huguenot nursemaids.
C. Most of them are so dark and gruesome that I could not stomach the original telling of them.
These tales had already been told and retold, and changed along the way, by many storytellers. The Grimm Brothers collected many versions of the same stories and tried to discern the most original versions to publish. They actually made several editions, including the 1857 where much of the cruder parts were taken away. Critics claim that the sanitized versions are devoid of any value.
The childhood home of the Grimm family is preserved as a museum. It was my favorite museum to visit on my trip. So many of the exhibits had fabulous art. Pity that we were not allowed to take any pictures of the exhibits inside. They displayed so many artistic interpretations of the fairy tales created over the years. I didn't see many that would be unsuitable for children. It was delightful!