Here's why:
* Cutie Marks are symbols of talent: Cutie Marks represent a pony's special talent and are given when they discover it. They aren't inherently good or bad.
* Villains have motivations: The villains in My Little Pony have their own motivations, which are often related to power, control, or a desire to change the world. Their actions are not based on someone having a Cutie Mark or not.
* Friendship is the focus: The show's main theme is friendship, and it's about overcoming differences and working together. The ponies learn to understand and accept each other, regardless of their Cutie Marks.
Examples of Villains in My Little Pony:
* Discord: A mischievous spirit who thrives on chaos.
* Queen Chrysalis: The leader of the changelings who feeds on love.
* King Sombra: A powerful unicorn who seeks to conquer Equestria.
* Lord Tirek: A powerful sorcerer who absorbs magical power.
These villains have their own goals and motives, and their actions are not driven by a dislike of Cutie Marks.
While there might be some instances of ponies feeling jealous or threatened by others' Cutie Marks, it's never presented as a major conflict or a theme in the show.