Stable, yes, until it's not. The OP point was that in case of an extraordinary event of a big enough scale - which your definition of a stable society doesn't e

Stable, yes, until it's not. The OP point was that in case of an extraordinary event of a big enough scale - which your definition of a stable society doesn't exclude - most(?) of the people won't make it because of the very different nature of these relationships. So, while a disturbance is less likely, its effects would be more dramatic.