Harrison assumes that animals are not the same as humans because humans experience physical and mental pain while animals only experience physical pain. The Case for Animal Rights. To prove his claim he uses two philosophical theories, Contractarianism and Utilitarianism. Contractarianism is a set of voluntary rules that individuals agree to abide by like protection of another property. Animals can be persons property and with Contractarianism the animals should be protected.
Utilitarianism has two moral concepts, equality and utility.
This means that everything should be considered equal and bring balance between the two parties. Therefore, with Utilitarianism, animals are equal to humans. In Rollin s article he argues that in the scientific society animal life is not better or even equal to human life. That is how most of the scientific population feels. His evidence shows that science does not make value, moral, or ethical judgments.