its different if you are killing it for eat. its what we have always done, because it isnt healthy to not eat meat. b12 in important and meat it the only natural source of b12, our bodies dont absorb b12 from sublimates as well as from meats. it also decreases testosterone levels when you dont eat meat. we are meant to eat meat, now if you are saying there is too many of us maybe that i can agree with you on, as long as there are this many people there will be able of cows getting killed.