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

A film with more than the usual spoiler issues. Talking about it in any detail feels akin to handing you a gift-wrapped present and saying, "I hope you like it -- It's a thriller about a diabolical secret experiment."

Easily the biggest piece of Right wing non sense propaganda I ever saw.

After playing with our expectations, this turns out to be a very different sort of film.