Following Jeremy Bentham, Singer argued that the interests of animals should be considered because of their ability to experience suffering and that the idea of rights was not necessary in order to consider them.
Dengan memakai argumen Jeremy Bentham, Singer menyatakan bahwa kepentingan hewan juga perlu dipertimbangkan karena mereka dapat merasakan penderitaan, dan konsep hak sama sekali tidak dibutuhkan untuk mempertimbangkan hal tersebut.