Eating meat is natural and occurs whether you and I exist or not.

So is killing the top ape in your troop so you get his harem. So is eating the babies of the former troop leader so you free up the female apes to care for your offspring instead of his. Nature is a hellhole and more importantly, isn't a deity or even a conscious being. It has no morals, nor a will, nor any opinions on how living things should act.

If you're going to enjoy the comfort of modern technology, especially modern food production technology, the "nature" argument is not applicable because none of the food you eat is remotely natural. You're welcome to sharpen a stick with your teeth and use your real human hunting skills to get your meat, i.e. chasing down wild animals until they die from exhaustion. Better hope that wild bull with razor sharp horns that weighs three times more than you doesn't figure out that they can just turn around and attack you head on, because hunting large animals is lethal to the hunter almost as often as it's lethal for prey. You also better not use any antibiotics if your hunt leaves you wounded, because animals getting slowly and horrifically killed by bacterial infection is natural and occurs whether you and I exist or not. Microbes are your only real predator so you better respect that.