Wikipedia:

The first volumes were much criticized because, although they were called "Children's Tales", they were not regarded as suitable for children, both for the scholarly information included and the subject matter.[3] Many changes through the editions – such as turning the wicked mother of the first edition in Snow White and Hansel and Gretel (shown in original Grimm stories as Hänsel und Grethel) to a stepmother, were probably made with an eye to such suitability. Jack Zipes believes that the Grimms made the change in later editions because they "held motherhood sacred".[4]

They removed sexual references—such as Rapunzel's innocently asking why her dress was getting tight around her belly, and thus naively revealing to the witch Dame Gothel her pregnancy and the prince's visits—but, in many respects, violence, particularly when punishing villains, became more prevalent.

People had much less empathy than they do now. Steven Pinker talks about this in The Better Angels of Our Nature.