My view,
There are many things upon which I'd like to point out where many people in this thread are continuously using what is known as a 'straw-man' fallacy while replying to various statements, keep on topic, please. Rather than call people out, I'm going to address the root problems of this argument's question Space wants to be answered: "Is eating/killing animals morally wrong and not necessary?"
Before you can determine if eating animals is a vile principal to have, you must first ask the question: "What is the truth of human morality?" What determines killing and eating an innocent or wild animal to be wrong? From what I have read: 'Meat isn't a necessity anymore now that we find a vegan diet is healthier'. Okay, I'm going to agree with you even though I'm not a vegan or vegetarian. Though I would like to point out that many types of meat have, especially chicken and steak which have far healthier remedies which plants such as tofu lentils etc do not have enough of when compared to these meats. I'll give you an example, a common food to negate the effects of colds and flu back in the day though still used today and highly effective in today's world, was a simple recipe, chicken or lamb stew. Such food would give your body amazing protein spikes, rejuvenating your body. Now with this medical knowledge in mind, if I was asked if I wanted to have a ceaser salad when there was another healthier option to be had, I'd go for the soup. I need more instant and highly effective nutrients due to my body-type. I eat Veggies by the way. ;)
There are many animal rights activist (Not saying you are part of such a cult, though at this point it is highly likely from the way I'm reading your argument) factions who feel that eating animals or bringing them to harm is morally wrong. Where do they build this 'Social Construct' on? A bandwagon fallacy, all because some vegetarian philosopher gave his high and mighty 'educated' opinion. Don't get confused, I'm not being biased. I'm using facts, facts don't have feelings. Do you want some facts? Very well.
In the 1970-80s there was an overpopulation of deer in the state of Virgina, hunting season was called off on account of 'people who were depressed that animals were being killed and were annoyed from the gunfire' for a whole year! The deer population at the time was already extensive as it was. In the middle of the next yearly hunting season, it took hunters nearly 4-5 months to bring the deer population back down to a reasonable level. This had to be done to reduce the tick-bite fever and a number of other diseases that were effecting other animals and humans alike.
This has been disproven.
The truth is if the human race doesn't keep the population of highly breedable animals down, we live an unhealthier life. Now, eating the meat of an animal, overpopulated or not, is this wrong? Obviously not if it is to help the human race and the animals which need to be kept under control for the animal's health and human's. Letting meat go to waste creates a very unhealthy environment. (I know that decomposing bodies creates rich soil, I'm talking about meat which has just been freshly cut. This is where the concept of our morality really comes into play, are we going to continue to make fruitless arguments whether upon eating animals is wrong or simply unnecessary? Why do you think most dying dogs are put down? Because we believe as humans, this animal shouldn't deserve to suffer anymore. This is the human morality I stand for. Same with dying livestock, don't let it go to waste otherwise you are just causing more harm to yourself and the planet in general. It is okay to have the wrong opinion on certain subjects, hence why debates were created so that we might learn from each other. Doctors and medically trained humans up until the 1920s believed that it was healthy to bleed the 'sick' out of people. Which basically meant, you were going to die.
It has been natural for thousands of years! Your claim that 'murder is something natural that we reject', is a false, you speak as if you were a serial killer no offense. I am questioning your morality so hard right now. Murder is not a natural thing at all. According to the statistics, suicide trumps murder cases 7/1.
There are many other philosophers and other very knowledgeable people that are wrong in this world. Humans are not perfect, we are all different. You can be a Vegan, you can be a meatatarian. Though it is highly encouraged to examine yourself and others to figure out the truth behind what is 'fact' and what is simply, your feeling on this topic.
And I'm done!