I was looking through IMdb and I noticed this in the trivia section. "Unlike the original book, the Once-ler is shown fully in the story as a human. Executive producer Christopher Meledandri said of the change, "The minute you make the Once-ler a monster, you allow the audience to interpret that the problem is caused by somebody who is different from me, and it ceases to be a story that is about all of us. Then it's a story about, 'Oh I see, the person who led us into the predicament is not a person. It's somebody very, very different.' And so it takes you off the hook." But the problem with that is that it takes away the message of the book, and people wonder why I think this generation and the next is doomed with idiocy.