Let’s start with another, related question: are human rights an ideology? There is indeed an ideology of human rights, at least as long as we use a value-free meaning of the word “ideology”. (Some argue that human rights are an ideology in the value-laden sense of the word, but that’s not what I want to talk about now). Human rights are an ideology because they form a widely shared system of ideas, and these ideas form a comprehensive vision of the world (see here for a definition of the word “ideology”).
Now, some have argued that the ideology of human rights, when compared to some other ideologies, has been a complete failure. Christianity, nationalism and Marxism for instance (one can perhaps add other ideologies such as Islam) have done much better over the course of history (although the role of Marxism is now finished, it seems). Over the course of decades and even centuries, those ideologies have been exported and implemented throughout the world. They have created mass movements, mass mobilization, political institutions, churches, political parties and rituals. They have inspired art, feverish devotion and legal codes. Moreover, they have proven to be able to adapt to local circumstances.
Human rights have achieved nothing of the kind. True, there are some international human rights courts and certain human rights have made their way into treaties and national constitutions, but those courts, treaties and constitutions are terribly ineffective in most parts of the world. No political party anywhere has human rights as its central goal. There are the occasional mass protests when some rights of some people are violated, but there’s always a distinctively ad hoc feeling about those protests and mobilization of this kind pales when compared to the movements inspired by Christianity, nationalism and (until a few decades ago) Marxism.
It’s true that Christianity, Marxism and nationalism were “successful” in one sense of the word. They were popular ideas, popular enough to have real life effects, but one can argue that they were not successful tools for human betterment, at least not overall. The contrary may be the case (see here for examples). And, in the end, human betterment is the only success that counts.
Furthermore, the success of ideologies such as Christianity, nationalism or Marxism was based on the fact that they were adopted by rulers. They became in some sense or other “official” ideologies and could therefore be imposed. Again, that’s not really the kind of “success” that counts. Human rights, although they also can, theoretically, be adopted by rulers, have seldom been an official ideology, and this fact may be indicative of their failure. However, the success of human rights should not be judged by the degree of their official adoption. After all, rulers don’t have an incentive to adopt human rights. They have an incentive to destroy them. The success of human rights should be judged on the basis of real improvements in the lives of real individuals. And in this sense of success, human rights have been anything but a failure, especially when compared to other supposedly more successful ideologies. This doesn’t mean that the success of human rights has been profound or conclusive. We’re not there yet.