Pelgris

Defining language is useful to a subgroup in the beginning stages. It allows them to self define as other without the ambiguity of an explanation. It further allows those outside the subgroup to show support or lobby on behalf of the subgroup to those at a further remove. So it is a useful tool. However, like most truly useful tools, it is dangerous. There is a tendency to use the self definition to elevate to a point of superiority. Either over those outside the subgroup or, if the subgroup is sufficiently large, as it splinters and those groups adopt defining language of its own.