The Green Inferno.
First rate horror film. A group of college students/student activists, led by a charismatic Latin American name Alejandro, go to Peru to stop the destruction of the rain forest and it's indigenous people by chaining themselves to trees and filming the destruction by bulldozers, ( who are accompanied by armed mercenaries), with their cell phones, while the world watches via satellite. It becomes clear Alejandro is actually just a douche bag when he almost lets one member of his team, a freshman and daughter of a UN official, to be killed for his cause. Arrested after their stunt, they're put on a plane where they celebrate their victory, when the engines explodes. Crashing in the Amazon, the survivors find themselves captured by the very tribe they had been trying to save, who prove to be cannibals and head hunters.As one after another is dismembered and eaten (not always with the benefit of being killed first), it becomes clear to everyone Alejandro isn't just a douche, but a narcissistic sociopath who is willing to let everyone else die before him so he can live long enough to be rescued by the rival forest clearing company he had really been working for.
The twist at the end is concerning the sole survivor's choice regarding the fate of the natives who had butchered and tortured them all.
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-Bill, otherwise known as Kraichgauer