It comes from their evolution. They used to stay back with the kids when men went out, so they became the ones to maintain order, not establish it, but keep it. This, combined with their reproductive tactic of assuming the social norms that is most immediate to them, results in the behavior you see today. Women are always the first recruits of a cult, the most numerous of members, and the most loyal to the ideology, this is the result of traits the benefits the genes of women who came before them. Women are bith wired to be conformist, and to be the enforcers of conformity.