Ethics, Rights, Identities and Interests
Ethical considerations have no meaning if they do not lead to better life for the participants in a social interaction. The road to hell is paved with good intentions (Dante). Due the complexity of modern life, though, it is often difficult to foresee the consequences of a certain action. That calls for the creation of rules of behaviour based on a concept of universal rights. It could be that in a disconnected world people can attempt to create a particular concept of rights applicable only to their group (that is what sects do) but that is impractical if impossible in an interconnected world. Rights are there to protect interests which on their part are how people perceive their need and that perception can be right or wrong. As this process itself is complicated and human beings are inherently lazy and bound to look for an easier way out we look for group identities in addition to our individual one to help us comprehend the world around us and the pursuit of our goals in it. (Additionally choosing a group identity can help us discover our true individual identity or further obscure it and destroy our personality.)
These ideas of ethics, rights, identities, and interests are constantly constructed , remodeled and abandoned in society and the more they correspond to material reality the more successful the societies and individuals employing them are. Also the fact that ideas are socially constructed does not mean that they are not real or arbitrary. The fact that they people use them to guide their actions makes ideas a powerful material force worth studying even as for most people social relations are much more important for the quality of their lives than interaction with nature. And the dependence of success and failure of any human endeavor on the relevance of ideas to reality consisting of nature and other ideas makes arbitrary choice of ideas a dangerous path to follow and therefore it is not so common.
People and communities chose ideas of ethical behavior, rights and identities based on their understanding of their interests. Therefore the study of interests seems like a good starting point for any inquiry into society and politics.