Snakes on the Plane

This movie is the scariest film I ever seen, but it is also very entertaining. However the thing i don't get on alot reviews on Yahoo Movies is why so many ppl finding this movie funny? Do ppl like watching other ppl getting killed on movie? What is wrong with people today?
Even though it is not real life, no little sympathy toward those died on the plane?! Just because something is not real, doesn't make it ok to feel amusing to watch so many ppl got bitten to death, even on a silver screen. maybe ppl like watching cruelity nowaday, maybe ppl's heart getting colder and harder. Anyhow, my impression of this movie is shocking, and sad for those unfortunate passengers. Scary is scary, it doesn't matter if it really happened or not. Just like comedy, when it is funny, it is funny. Nothing is really happening in a film. They are all fake. Even film that is based on a true story, when audience watching it on the silver screen, it is still not real. So we should treat all movie the same, and evaluate whether it is scary or funny without the factor whether things really happened or not. Besides, ppl died in such horrible way in the film, the way they are killed is not even look funny. How do some ppl find that amusing...