According to research by Smetana and others, even young preschool children are bothered by violations of a moral rule, such as

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Young preschool children are bothered by violations of a moral rule such as pulling hair, which falls under the category of harm caused to others. Chewing gum in class, spitting on the floor, and not saying grace before eating do not necessarily cause harm to others and may not be considered violations of a moral rule by young children.

According to Research by Smetana and Others, Even Young Preschool