It sets up Oedipus’ commitment to his people and his desire to help them.
Explanation:
According to the passage, Oedipus notices the recurring living conditions of his people and comes forth to raise their morale. In order to achieve this, he promises to "assist" his people "willingly in every way", and to become a "hard-hearted man". This effectively proves Oedipus' commitment to help his people.
It goes without saying that the fact Oedipus deems it necessary to help his people means they are in trouble.
