the vast bulk of the food they eat is grown agriculturally.
sure, but I can’t eat cornstalks and I don’t want to eat soy cake, so feeding that to livestock is a conservation of resources.
Where are you getting your information?
The majority of all the plants that humans grow are fed to livestock. That’s just the fact of the matter. It’s not conserving anything, rather it’s incredibly wasteful. Human food crops could have been grown instead, on a fraction of the land.
And again, you don’t really give a shit. It wouldn’t change your behaviour to discover you are mistaken, it’s a disingenuous argument. It’s sophistry.