Edit: I’m being cute here but it’s a bullshit comparison because the act of cannibalism is so morally repulsive that the scenario of human meat farming is absurd and impossible. In this scenario our systems actually function as intended since the consumption of human flesh is illegal.

This is sort of my point, though. The idea that veganism is a personal responsibility narriative only works if you assume that farming doesn't rise to a sufficiently high leval of moral repugnance. Otherwise we'd all say "fuck the practicalities, there's no way I'm partaking in that", especially when in this case partaking is something as visceral as eating flesh or other animal products. The whole point of videos like the one in the OP is that for many people if they were truly confronted with the realities of livestock farming, it would rise to that level of repugnance.