Why couldn't they have made the resident evil movies with the same plot lines as the books and the videogames?

If res. 1, 2, or three or their remakes were made into movies as they were, they would have been epic. The movies- so far removed from those great nailbiting edge of your seat storylines and just straight up tacky and horrible. I mean they had the Nemesis lose a FISTFIGHT to a woman for crying out loud when in the game it took a RAILGUN to kill him after he mutated and grew. Just don't understand how the resident evil franchise was allowed to become the steaming pile of crap that it did.

Why couldn't they have made the resident evil movies with the same plot lines as the books and the videogames?
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