I've recently seen a couple of people defend/promote vegetarianism on the argument that it's immoral to eat animals, for they are animals with the same right to live as humans. Usually bolstering the argument with the fact that most meat/eggs/dairy is produced in a CAFO setting (akin to torture, with which I agree). I understand that, but why differentiate between animals and plants? Are plants not as alive as animals? Shouldn't they be accorded the same rights?
Plants are the tallest organisms (trees), oldest (trees), largest by area (fungus), etc.
It seems kind of arbitrary.