.Its all about balance and the eco system and survival.Humankind couldn't have survived or evolved had they not been meat eaters.Pre-historic man was pre-dominantly a hunter . Cultivation was necessary as an alternate food supply for survival. Now Lets take the cow for eg. it was in it mutual benefit for the species to survive to be allowed to be eaten,its has helped the survival of the species. Also if everyone were just Vegetarians,there's always a high demand for milk , the cow gives milk but for her to continually provide milk she has to have more calves.If ones doesn't eat them there would be a population explosion. Do most Vegetarians not use Leather products?? or any product that is made from animal extract. If they do thats hypocritical. Coz the animal is only slaughtered for their skin so one could own a piece of fancy leather!!. By consuming the meat of the animal the death of the animal is not in vain and every part of it is being utilized in one form or the other. Man has definitely abused hes power and have resorted in unethical practices and i am not debating that.