Personally I have been vegan for a year and a half and its mainly due to the fact that I recognise the wrongness in exploiting sentient beings by killing them so that we can eat them, etc etc. Also the DNA of an animal is so close to a human that it could also be considered a form of cannibalism if you eat them (think about that the next time you eat a mouth full of animal flesh)
I still have to watch that one yet, I’ve heard its good. I’ve only ever seen dominion, which I watched after I became vegan.