It’s not a question of “all living things”. “Sentient” is the key word in this case. There are no biological mechanisms by which a bacterium or yeast cell can experience pain, fear or sadness. Animals do have this capacity and they display responses to these feelings very similarly to humans when subjected to them.
But even if they did, we need air and water to survive, but we don’t need to eat animals. If you don’t need to eat animals to survive, you’re only killing them for pleasure.
It’s not a question of “all living things”. “Sentient” is the key word in this case. There are no biological mechanisms by which a bacterium or yeast cell can experience pain, fear or sadness. Animals do have this capacity and they display responses to these feelings very similarly to humans when subjected to them.
But even if they did, we need air and water to survive, but we don’t need to eat animals. If you don’t need to eat animals to survive, you’re only killing them for pleasure.