I'm of the belief that our food is tainted when we mistreat animals in this way, which is why I follow Michael Pollan's rules for eating: Eat food. Not too much. Mostly plants.
I know some advocate for the whole world to be vegan, but since that's not a practical option at the moment, there has to be a better way of humanely caring for what eventually ends up in our bellies. No wonder we all get cancer. We could care less about our food chain. This video is disturbing at best.