This is absurdly reductionist. You can equally say that in a collectivist society everyone contributed for the sake of themselves and not for the greater good o

This is absurdly reductionist. You can equally say that in a collectivist society everyone contributed for the sake of themselves and not for the greater good of the collective, to avoid being shunned and starved. Individuals are always individualist unless they get lobotomized. The question of governance is how to manipulate that individualism to good ends.