Because the only plot points that this film shares with the 1974 horror film of the same name is that it is Christmas and female college students are being murdered. This thing is really an insult to that 1974 slasher. The 2006 version has its own problems, but that's another story.
It's aiming for a social justice theme, and such films can be good if you have interesting and nuanced characters and a good plot. "Just Mercy", from just last year, was such a film, and I'm not sure why it isn't better known. But unlike "Just Mercy", this film presents all but a couple of its characters as shrill stereotypes.
It's just a case of bad filmmaking. The players launch into speeches about what is happening in the plot either because the filmmakers think the audience isn't smart enough to figure things out, or because they realize they are doing a poor job of storytelling and have to use these speeches so everybody can go "Oh, I get it now!". I'm going with the latter. All of the horror scenes seem truncated to the point that you don't really know what happened to individual characters other than probably something really bad. This most likely has something to do with the PG-13 rating, and although there are ways of doing PG-13 horror that work, none of those methods are being employed in this movie.
As for the end? The heroines wouldn't originally go to the cops because they couldn't explain three dead bodies in their house. How will they explain what happens at the end? As for Cary Elwes, without giving anything away, his speeches in The Princess Bride were good practice for what goes on here, but then that was a timeless satire. This is just a bad film.
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