I think they focused more on what that can affect the minds instead of what could be the main reason. We see slaughterhouses, yes, they are brutal. I was a vegan and now I'm a vegetarian. For those who aren't veg, this question might occur: "But what if they weren't brutal?". No direct answer was mentioned.
The second thing that was not so good about this documentary was the accessibility of vegan products for all people. For small cities, finding such products is hard or not possible, so that transition to veganism might not be as easy as they say.
