I would be interested to see whether you can provide more than intuition and a vague assertion the you have done research. Quotes and sources please, or stfu about your research.
Gosh, this is a fairly large undertaking in itself, but fine.
For a straightfoward review of the nepotistic streak in morality see pp. 45 - 50 of Richard Joyce's
The Evolution of Morality.
The paper
Sympathy and Callousness provides an interesting look at our tendency to provide less moral regard to anonymous, statistical victims with whom we do not associate. In other words, we have a tendency to give greater moral consideration to those within our community with whom we have a personal/emotional connection to the detriment of those anonymous/statistical persons outside our community.
There is a fantastic three volume series on
moral psychology by MIT press, the fisrt of which deals with the evolution of morality. References to research on kin-directed altruism can be found on p. 175, most notably to the work of W. D. Hamilton who has published on the evolutionary tendency towards
kin-directed altruism (i.e. the tendency for altruism to be directed
specifically towards kinship groups) as well as selfish/spiteful
behavior.
For a
classic in the field see Axelrod's
The Evolution of Cooperation (in particular the conclusions in Ch. 9 'The robustness of reciprocity) which uses computation of payoffs in multiple iterations of the Prisoner's Dillemma game in order to show that the most successful strategy tends to be TIT FOR TAT, which initially engages in cooperation but then engages in retribution if ill-treated. TIT FOR TAT therefore models such moral principles as reciprocity, the golden rule or 'an eye for an eye' (interestingly, then, in anthropological studies reciprocity, along with the valuing of family, appears to be one of the few cultural 'moral constants'). Of particular relevance to you is Axelrod's suggestion (p. 174) that
"reciprocity can be self policing", i.e.
One of the most interesting researchers, imo, in the domain of moral reasoning is
Joshua Greene at Harvard (<-- see his website, as many of his papers are accessible). His primary concern is that our moral apparatus, which he contends has developed through evolutionary processes, is ill suited to certain parts of modern life. His research program, then, is to show why and eventually to suggest ways of dealing with the issue. His PhD
thesis contains an argument that humans have a natural tendency towards moral realism/absolutism which carries with it a certain stubbornness and tendency towards intolerance of difference (i.e. other cultural groups). Of interest is his theory of the dual-process model of morality which finds humans to be cool and more 'utilitarian' when reasoning theoretically, but tend to become absolutist/deontological once emotion enters the picture (e.g. when making decisions with a bearing upon loved ones). In some respects this dovetails well with the above paper on 'sympathy and callousness'. Greene also has an upcoming paper on 'The duty to support nationalistic policies' which will presumably examine the human tendency towards in-group morality and why this is problematic.
Also relevant is the tendency for immoral psychopaths to emmerge in a given population. On this topic you might look to the prolific researcher
Robert Hare. Of relevance here is (1) the prevalence of psychopathy (~0.5 - 1% depending on the study and population), (2) the tendency of psychopaths to engage in behavior which harms others and (3) the problem of dealing with such individuals who do not work within a moral framework. Also of interest: the high proportion of psychopaths in business, politics, law, etc --> this is an issue for
both anarchists and non-anarchists since immoral people have a statistical tendency to rise to positions of power. As far as regulating the behavior of such individuals the anarchist has to have blind faith in the efficacy of innate morality and inherited social tendencies, while the non-anarchist has to believe that we can know enough about the incredible complexity of human society/behavior to engage in regulation through institutional means.
As to the rest of your post, most of it comes down to agreeing to disagree. Let me know if there is a specific point or core argument that you would like me to respond to.