Why do parents die in movies?

In lots of Disney movies, parents die.

My explanation for this?

• Movies want to put you through lots of emotions. Laugh, cry, be happy, be sad, have anger, feel guilt. As many emotions as possible. Death and the resulting emotions are a natural part of a bigger system.
• When someone dies, two things should happen (and, thus, the need for parents to die):
  • You need to be attached to the person.
  • Similar to what happens to real life situations, older people die first.
• Finally, if only bad people / characters would die in movies, you would remain with the impression that when someone dies it’s a good thing, the Planet is a better place now.