Ben Burch said:
If demand for meat and leather dropped to zero, do you think any domestic cattle would continue to exist except in zoos?
I assume you meant to include dairy as well.
In which case: No, but I don't see why anyone should care. Species go extinct all the time. A domesticated animal that is of no value going extinct is hardly concerning.
bottsranzee said:
What about the killing of the vegetable plants!? Stop the vegans!
You're not really claiming killing plants is an ethical problem, are you?
First of all, pain, suffering, fear, desire for freedom, yada yada yada; these are all functions of the
brain. There is no evidence that plants, or any other brainless entities (e.g. brainless animals like sponges, rocks, soda cans, etcetera) are capable of experiencing pain, or experiencing anything, for that matter. You might come back with "but we don't know for sure!" This is correct. We also don't know for sure if there are invisible unicorns orbitting the Earth who go through agonizing torture every time you masturbate. Without evidence it would be foolish to act as if either of these things were true.
Additionally, following a vegan diet kills less plants. So even if killing plants were cruel (which it isn't), veganism would be the best way to go.
Correct me if I'm wrong, but I get the sense that the people who argue animals will go extinct if we stop farming them wouldn't actually care (ethically) if these species were to go extinct, and the people who argue that vegs are mean to plants don't actually care about people being to plants.