Now, I do still eat cheese and milk, because--and vegans should be aware of this--the main reason cows still walk this Earth, or at least this continent, is because they are economically valuable to us. I would not have much faith in the survival prospects of a feral population of cows. It's arguable whether imprisoning and exploiting them is better than extinction, of course.
I understand your point here, but ethics to me is about motives for actions, not the indirect consequences of those actions. I care about the treatment of individual life, through the direct (motivated) consequences of our choices.
When I say direct consequences here I mean something akin with a ball rolling unstoppably down a hill. Indirect consequences are those which can be averted through cognitive expression, or are unforeseeable symptoms of chaos, and we're not morally responsible for those. I avoid the existential problems of causality with this approach.
If cows were no longer economically viable, then became feral, and then became extinct, then so be it. We're not morally responsible if they are unable to prosper. I'm not against natural selection per se, even though I do take an holistic perspective of the natural world, and understand that the loss of a species could have cascading consequences. It may be in our best interest to provide protection for cows. That wouldn't be unethical. Farming them is something different.
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