a newish strong anti-veg*n argument that ive heard passed around: harvesting grains/vegetables from fields hurts a lot of small rodents and other wildlife, thus making eating from fields less ethical than eating from barns
this is worth thinking about if youre veg*n
a counterargument: lots of farm animals are fed field-grown grains, harvested the same way as everything else
but not all! cows in particular are more likely to eat wild scrub in areas like the american west, where there isnt enough water to support fields