@Dark Green Man If you read the manga from Chapter 599 to 700, you will know that the manga doesn't stop trying to make us feel sad for a guy who murders thousands of people over one girl's death, and the anime does this a lot more non-stop.
Vader's unsympathetic retcon in Empire Strikes Back became overkill for villains within the entertainment industry, especially Naruto villains.
@Hagane no Saiyajin Cell had so much more potential to be interesting than just an egotistical green Frieza.