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That's the idea: not to harm any life form. At all.

technically that's not possible...life lives on life. the white cells in your blood destroy other forms of life that seek to harm you.
That's what sickness is...life attacking life.

the discussion is going in a very complex direction. I would say that "life lives on life" is just one way to see things, not necessarily the true one. Just until 500 years ago, we, humans, knew that the earth stays on top of a giant turtle.