When you're a very small child, losing a parent is likely to be your single biggest fear. Disney made that fear ten times worse when they gave us 'Bambi,' in which the title character has that exact experience.
While on an innocuous stroll through the forest, Bambi's mother is taken from him suddenly and brutally by a bullet from a hunter's gun. We cried as children. We cried as adults. We're crying now while we're thinking about it. Why would they make kids watch this?