The app for independent voices
A bit of friendly advice: If you actually have a good-faith question, simply ask the question. Don't follow it with a gish gallop.
The answer to your question is that each of us has a right to do what we must to survive; none of us can survive without causing harm to others; and yet we have an obligation to reduce that harm as much as we reasonably can.
Humans eating animals that ate plants requires far more plant farming than humans eating plants directly. Whatever harm is done by plant farming, vegans are causing far less of it than those who eat other animals.
Which is why we could reclaim 75% of the world's farmland—"an area equivalent to the size of the US, China, Australia and the EU combined"—for wildlife, not to mention put an end to the greatest source of suffering ever devised, if we stopped eating animals and started doing the right thing: