The production and consumption system depicted here in the movie Samsara emerges out of a much broader range of societal and ethical dispositions than most of us are perhaps prepared to acknowledge. I certainly doubt whether our food choices alone could foster a world like this.
It used to be jarring to rub up against dogmatic vegetarians or vegans working in the consumer marketing industry. It didn't seem to have occurred to most of them that their unilateral opt-out at the supermarket might not actually be helping all that much, or indeed that their professional activities might actually be making things worse. Yet one could even say that just by living in a big, modern mega-city one tolerates, and to some extent promotes, this sort of food production.