Have you seen the new Jurassic Park movie, Jurassic World? It had the biggest opening of any movie in history. The movie tells how a reckless biotech company releases dinosaurs that kill its customers. Its tale of heroes vs. villains made John Stossel think about how America has changed since our independence, the anniversary of which is celebrated this weekend. Hollywood needs heroes and villains, and over time those roles changed. It was once cowboys vs. Indians, then Americans soldiers vs. Nazis and "Japs," then Russians, then Arabs, then… Well, writes John Stossel, now Hollywood is more careful about whom it calls a villain. But one group is always eligible—businessmen.