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The documentary is targeting the meat industry and all affiliates. They do this because it is from an aggressive vegan perspective which makes their opinion biased.
This is the exact same situation as when the sugar industry paid for and promoted research and documentaries on how eating fat makes people fat and not sugar.
They are simply pushing their agenda. Also they provide zero proof for their evidence. So therefore if you believe what they are telling you, you are blindly trusting them.