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The calorie/carbon exchange for growing plant based food is lower than that of raising animals for food.
Ethics are a construct created by humans. Nature is not ethical. Survival is natural. The strong survive, and the strong need protein. Long live steak.
Everyone defines his/her own ethics
There is less suffering for sentient beings.
Some animals that have been bred to produce milk for human consumption rely on being milked regularly or they will otherwise suffer pain and eventually might die. Completely and abruptly switching to a vegan lifestyle would therefore cause animals to suffer.
A global shift towards a vegan diet is necessary not only to ease the suffering of the millions of animals killed daily, but also to save the world from hunger, fuel poverty and the worst impacts of climate change.
It is most ethically viable in the current agribusiness environment.
A completely chemical diet without any living ingredients would be more ethical
Animals also die from vegan and vegetarian diets, and their bodies aren't even put to use.
a completely vegan diet is not suitable for children
Animals in nature eat each other as a way of life. Limiting human's nature as omnivores is unethical.
Eating vegan CAN be ethical but you can still eat vegan and eat unethically. You can still support bad corporations while buying their vegan options, you can buy vegan good that is not socially conscious (slave labour/gmo crops/come from companies that engage in all kinds of unethical things) etc.
Morality is a finely sharpened tool human's ancestors developed through evolution to help them spot noncontributing members of the group. This is essential for group-work. Sometimes humans can use "shortcuts" of thinking in inapplicable situations getting them to reach the wrong conclusion
Caring more about animal lives than the level of vegan diet being possibly available to everyone is putting animal lives and human lives on the same level which, in itself, could be considered "humanly" immoral.
Feeding from animals is important for the biological cicle, except in species in extinction. Nature doesn't follow what is more ethic and yes what is more advantageous.
Animals and plants have the same value in life as default. The most ethic way to eat is by balancing between plants and animals so that the ecossistem is kept working well and every life form keeps on living without much interference.
with each pound of meat given up in the production possibilities curve between meat production and non-meat production there are decreasing marginal returns; in order to continue feeding we would necessarily have to expand farmland and encroach on wild species habitats
Plants have feelings too
A whole foods, plant-based diet is a healthy diet. This means that a vegan person is more healthy. Health renders a state of well-being. Well-being is better than non-well-being. Thus, a vegan diet is more ethical when it pertains to humans.
But it is not the most beneficial diet as far as minerals, vitamins, and proteins go.
This assumes you care about other animals. If you do not care then it is not more ethical to not eat them than eat it.
Many people cannot afford or do not have access to vegan foods. It would be unethical to establish a system of ethics that uses money or circumstance as a barrier to entry.
You are an omnivore and you should fucking act like it.