there are ethical motivations behind many of the vegetarians and vegans due to malpractice and mistreatment of the animals that supply us with our meat. Have you ever seen the state animals are kept in and how they are treated? It is not a pretty sight.
Others just don't like the taste of meat. that simple. It's like how some people don't like fish (yes i know that's meat, it's just more common than not liking beef for example).
Still others do it for religious purposes.
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