I kind of noticed something in a large number of dinosaur movies.  Why is it that plant-eating dinosaurs (herbivores), such as sauropods, ceratopsids, and what-not, are never portrayed as antagonists or showing them attacking people? It's always been kind of confusing because they always show the carnivorious dinosaurs go on rampages, but never the plant-eating ones. They weren't always peaceful. They could potentially stomp on you if got in the wrong spot or provoked them. The only example we got that I know of that was kind of close to that in recent times was in Jurassic Park 2 when the Triceratops was one of the dinosaurs attacking the camp-site.

One of my favorite and one of the very few instances of such cases was in the 1925 silent film, The Lost World (Sir Arthur Conan Doyle version). The final sequence featured a captured Apatosaurus (called Brontosaurus in the film) escaping its captors and destroying London and terrorizing its occupants. How come we don't see things like that anymore in dinosaur films? If they ever do make a big-budget Hollywood remake of Conan Doyle's Lost World, I hope they keep that scene in.

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So, why do you think we never see instances in dinosaur movies of herbivorous dinosaurs commiting villainous actions anymore?