People and animals are all part of the biosphere, but humans hold the greatest power; furthermore, when the environment is damaged in the end it may be humans themselves who suffer, and it would do people no harm to take a little more care of animals 'basic needs and to reduce their suffering when they are being "used."
人與動物都是生態圈的一份子，只不過人掌握了最大的優勢，而且生態一旦破壞，最後的受害者可能是人自己，多照顧一點動物的基本需求和減少牠們被「使用」時的痛苦，對人類也並無損失。