Recognizing this is essential to comprehending the book's message. A more complete appreciation of that message deepens our understanding of the haftarah choice. This is the behavior which God models with Nineveh and Yona. God attempts to teach this perspective to Yona. Yona himself has a different attitude.
Truth demands punishment of immorality.
It is the one which Yona himself gives as he prays for death after successfully completing God's mission. This displeased Yonah greatly, and he was grieved. That is why I fled beforehand to Tarshish. For I know that You are a compassionate and gracious God, slow to anger, abounding in kindness, renouncing punishment. Please, YHWH, take my life, for I would rather die than live.