On top of that, the director was out on trial for killing his actors. Yes, there was actually a controversy as to if Ruggero Deodato killed his actors to make the film seem more realistic. Knowing this little tidbit about the film definitely makes you question what you are watching, if you are truly watching people being murdered or not. Now, that ultimately was not the case. He just made the actors sign contracts that enabled them to be seen in public until the film was released, obviously a contract he had to break so that he wouldn't get put in jail. And the tribal girl that Tdigs mentioned was skewered on a pole. Well, they claim she wasn't actually killed but because she was a native or wherever they were filming no one knows for sure.
If I need to give any more reasons then I will, but I 100% believe Cannibal Holocaust wins this round.