There are a lot of interesting dynamics as to why someone may end up outside of a group. Some people isolate themselves for all sorts of reasons: a feeling of inadequacy when comparing themselves with others; social anxiety; or maybe a loss of interest in the ideals of the group. Many times, however, it is the harsh reality of community that pushes a person along the road of exclusion.
The administrators of one of the WhatsApp groups, of which I am a part, have grown fond of removing people from the group for all sorts of infractions, the length of the expulsion depending on the gravity of the offence. Two or three members have become the ‘conscience’ of the group and in great measure define its character.