Indeed, I did not make that clear.

All farmers - Not nihilistic, Not stable

All pillagers - Nihilistic, Not evolutionary stable

Some ratio of pillagers:farmers - Not nihilistic, Evolutionary stable

Where nihilism means that the society is very self defeating that it collapses instantly. And evolutionary stable means that the society can maintain it's general composition for a long enough time period.

P.S: There is probably a better word than nihilism for what I have chosen it to mean.