Why do vegans believe they are saving animals by not eating them?

All it takes is for an equivalent of people as vegans to eat two steaks in one sitting instead of one and the same damage is still done, so basically when people go for seconds they are eating for a vegan, if the animal is still dead then isn't it better to eat and get nutrients out of it then to not eat it and letting it die in vein? 🙃
Why do vegans believe they are saving animals by not eating them?
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