Do vegans really have a good reason not to eat meat?

I don’t wan it to come off hateful anyone can live how they want. I know some vegans do it for the health benefits and some do it just to say they don’t eat animals are these the only or main reasons? And for the none vegans or people who are no longer vegan are the quote on quote benefits as rewarding as some make it out to be was it ever really that serious to begin with?
Do vegans really have a good reason not to eat meat?
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