Animal rights the interests of the worse off more important than those of the better off. Another approach, virtue ethics, holds that in considering how to act we should consider the character of the actor, and what kind of moral agents we should be. Rosalind Hursthouse has suggested an approach to animal rights based on virtue ethics. Mark Rowlands has proposed a contractarian approach. Nussbaum (2004) writes that utilitarianism, starting with Jeremy Bentham and John Stuart Mill, has contributed more to the recognition of the moral status of animals than any other ethical theory. The utilitarian philosopher most associated with animal rights
Jeremy Bentham came to expressing it was in the form "the good and happiness of the members, that is the majority of the members of any state, is the great standard by which every thing relating to that state must finally be determined". The "greatest happiness principle", or the principle of utility, forms the cornerstone of all Bentham's thought. By "happiness", he understood a predominance of "pleasure" over "pain". He wrote in "The Principles of Morals and Legislation": Bentham was a rare major figure in the history of philosophy to endorse psychological egoism. Bentham was a determined opponent of religion. Crimmins observes: