The Alien Encounter is an example of a great ride, that people LOVED. It was a touch of a more adult approach to a ride, and Disney had signs posted all over warning people that is could be too intense for young children. But because people cannot, or choose not to, read they brought their young ones in there and they were scared.
Of course now we have the horrible Stitch Escape. It is an empty shell of what Alien Encounter used to be. And all because the masses have to suffer because someone has a kid who is scared. Meanwhile, 99% of the parks are kid friendly.