Both plants and animals are important in our diet. In the ancient world, people were hunter/gatherers who ate what they found. Our ancestors did not complain about the "morality" of eating. They were very healthy, and I am sure that, on average, our ancestors were much healthier than modern people. They did not face problems such as obesity and anorexia. The obvious conclusion is that we should live more like our ancestors and eat a balanced diet of plants and animals.
Archeology tells us that ancient humans were not healthier as they died young (30 was old) and their meat diets were the leading cause of early deaths.
I like the brilliant words of Darwin who said = "There can be no doubt that we are descended from barbarians."
Even in holy scripture that much is certain = that humanity is evolved from lowlife barbarians.
The human teeth give away the truth in that human teeth are herbivore teeth and our human teeth are not made for eating animal meat as are the carnivores. We can look at a dog or cat and they have pointed cutting teeth for eating meat and the animal meats are swallowed in large bites because they do not chew their food.
Plus the human stomach and our taste are not compatible with eating animal meat, and THAT is why humans have got to cook the meat and add flavoring to cover up the repulsive taste of the meat, and of course humans have to tenderize the meat or else it will break our teeth which do not grow back.
So often people claim that humans are meat eaters based on our 4 eye teeth and there is not an ounce of truth to that, but that dishonest claim makes them feel more justified in eating the trashy meats.
The point of civilization is that we stop acting like uncivilized animals.
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Well then you are missing out on the fun, because being vegetarian is great fun and adventure.
Whenever I go to a grocery store to buy food it feel like I am "hunting and gathering" by reading the ingredients and rejecting anything with any meat and hunting for the better kinds of food.
No person truly has control over their self until one starts controlling what goes into thy mouth.
When we look at little babies they put everything into their mouth, and the long process of human growth and maturity means to stop putting unhealthy things into thy mouth.