We demand Hasbro brings Derpy back!

Derpy was a character in My Little Pony and she was named Derpy because there was an error in the animation that made her eyes weird. Hasbro then said that someone might get mad at them even after one of the people working on the show explained how she could be like Goofy. Well Hasbro here is a question for you. Why did you kill her in the movie?