Why do most stepmothers in fairy tales mean?

Stepmothers in Fairy Tales are often portrayed as mean or evil to create conflict and tension within the story. This trope has been used throughout history to highlight the struggles and challenges faced by stepchildren in blended families, and to emphasize the idea that not all family relationships are harmonious. Additionally, it can serve as a cautionary tale to teach moral lessons about the consequences of mistreatment and jealousy.