The ban of cousin marriage lead to the situation, that people had to marry others, who were more distant to them. Hence, people identified less with other relatives and this fostered individualism.

Based. This is one of the reasons why I support cousin marriage. With modern genetic testing and screening, any possible downsides to cousin marriages can be easily mitigated. All over the world, cousin marriage is directly correlated to higher ethnocentrism, in-group preference, and stronger kinship bonds.