It's entirely possible that sending the audience out feeling lousy was intentional

The movie is made so realistic it has a lot of that WoW feeling at the right moments and never tooo over the top. the suspense is done so well and the emotion is felt. Very well put together with the music and all.

The film never slows down or bores, plunging from one harrowing sequence to the next.

There is definitely an excellent idea hidden in the background of the film. Unfortunately, it's difficult to find it.